Donny Miller 
I’ve accidentally ended up killing fish in nano tanks that I never would have lost in my 50-gallon. Not because nano fish are fragile — but because nano tanks don’t forgive the same mistakes a bigger tank quietly absorbs. A missed water change, a pinch too much food, one dead shrimp hiding behind a plant … Read more
Shrimp are the gateway drug of this hobby. They’re colorful, they clean up algae, and a lot of people assume they’re an easy first step into fishkeeping. They’re not — not because shrimp are hard to keep, but because most “shrimp tank starter kits” on the market weren’t actually designed with shrimp in mind. They’re … Read more
So you’ve got (or you’re eyeing) a 20-gallon tank, and you’re trying to figure out how many fish you can actually put in it without turning your living room into a science experiment gone wrong. I get this question more than almost any other. I get why a 20-gallon tank is one of the most … Read more
Five years ago, I made the exact mistake this article is trying to help you avoid. I added two White Cloud Mountain Minnows to my axolotl’s tank. On paper, it seemed reasonable — White Clouds are a “cold water” fish, they’re cheap, and every forum thread I skimmed had someone insisting it could work. I’d … Read more
I think of a canister filter as the “graduate-level” piece of equipment in this hobby. It’s not something every tank needs, and if you’ve got a 10-gallon community tank, buying one is honestly overkill. But the moment you cross into serious bioload territory, like a 55-gallon community, a goldfish tank, or a tank full of … Read more
There is something mesmerizing about a tiny, perfectly aquascaped world sitting right on your desk — a slice of nature indoors without sacrificing floor space. But here’s what the glossy Instagram photos leave out: smaller spaces demand a completely different strategy. A miniature ecosystem is actually harder to keep thriving than a massive display tank, … Read more
Updated 7 July 2026 Your fish tank heater is a life-support system, not an accessory. Fish are ectothermic — their body temperature, immune function, and digestion are entirely driven by the water around them. A sudden four-degree drop can trigger sickness like ICH — peer-reviewed research confirms temperature stress is a key predisposing factor for … Read more
Updated 27 June 2026 I don’t believe in just scrubbing algae; I believe in starving it. If you’re fighting a losing battle against green hair algae or cyanobacteria, your logic should lead you straight to your phosphate levels. After 15 years of managing high-tech planted tanks and community setups—from my 50-gallon community to my 20-gallon … Read more
Updated 28 June 2026 If you don’t understand the ‘why’ behind your water color, you’ll never achieve long-term clarity. One of the most frustrating phone calls I get from fellow hobbyists is: ‘Donny, my water is lime green, but there isn’t a single speck of algae on the glass.’ After 15 years of managing blooms … Read more
Updated: 13 July 2026 I’m all about using technology to make fishkeeping easier, but I’m also about the logic of accuracy. Many hobbyists reach for a digital aquarium water tester because they are tired of comparing color charts to a tiny glass tube. I get it—after 15 years and four active tanks, including a sensitive … Read more
Updated 27 June 2026 I see aquarium fertilizers as the ‘fuel’ for your underwater jungle. Many beginners make the mistake of dumping chemicals into the water and wondering why they have an algae bloom instead of plant growth. After 15 years of balancing nutrients in everything from my low-tech 50-gallon community to a high-intensity 20-gallon … Read more
Updated 28 June 2026 Every beginner’s first plant usually turns into brown mush within a week — and that’s not bad luck, that’s bad shopping. Most pet stores slap an ‘easy’ label on plants that actually need CO2 injection and high-end lighting to survive. After 15 years of scaping everything from my low-tech 50-gallon community … Read more
Updated 19 June 2026 I’m going to tell you something the big filter brands don’t want you to hear: if you’re throwing away your filter cartridges every month, you’re throwing away the health of your tank. I’ve spent 15 years maintaining everything from high-tech 20-gallon longs to my 50-gallon community, and I haven’t “changed” a … Read more
Updated 26 June 2026 High heat is a silent killer of the aquarium hobby. Most people panic when they see their thermometer hit 82°F and reach for the ice cubes, which is the quickest way to shock your fish. After 15 years of managing tanks through blistering summers—including my 50-gallon community and a sensitive nano … Read more
Updated 26 July 2026 The simplest calculations matter for the long-term health of your tank. One of the most common questions I get from beginners setting up their first fish tank is, ‘How much gravel do I actually need?’ It’s not just about aesthetics; it’s about providing enough depth for your Starter Bacteria to thrive … Read more
Updated 28 June 2026 I believe starting a fish tank should be a rewarding scientific journey, not a series of expensive mistakes. Most beginners are let down by big-box stores that sell them a tank and a bag of fish on the same day. After 15 years of maintaining everything from nano betta setups to … Read more
Updated 29 June 2026 I don’t view algae as an enemy; I view it as a symptom. If your glass is covered in green film or your plants are being choked by hair algae, your ecosystem is sending you a message about a nutrient imbalance. After 15 years of fighting every bloom imaginable—from ‘Black Beard’ … Read more
Updated 26 June 2026 The ultimate goal of any hobbyist is a “fish swimming in air” look. There is nothing more soul-crushing than spending hours aquascaping a tank only to have it look like a foggy swamp 24 hours later. I’ve been there—during the first few years of my 15-year journey, I wasted a small … Read more
Updated 26 June 2026 I believe your aquarium should be a centerpiece, not a source of embarrassment. There is nothing quite as humbling as walking into your home and being hit by a scent that ranges from ‘wet dog’ to ‘rotten eggs.’ I’ve been there—early in my 15 years of fishkeeping, I once panicked and … Read more
Updated 21 June 2026 The way I see it, light is the fuel for your aquarium’s engine. You can have the best substrate and the most expensive fertilizers, but without the right aquarium light for plants, your greenery will either melt or be smothered by algae. After 15 years of growing everything from ‘easy’ Anubias … Read more
Updated 27 June 2026 I look at substrate as more than just “aquarium gravel.” It’s the second-largest biological filter in your tank and the anchor for your entire ecosystem. Whether you’re setting up a 20-gallon long for heavy planting or a simple 50-gallon community, the logic behind your choice determines your water clarity and plant … Read more
Updated 7 July 2026 I don’t look at a filter as a box that cleans the water; I look at it as the “Lungs and Liver” of the aquarium. After 15 years of testing everything from sponge filters in my nano setups to massive canister filters on my 50-gallon community, I’ve learned that the “best” … Read more
Updated 22 July 2026 I view oxygen as the lifeblood of the ecosystem. Whether you’re driving a sponge filter in a nano betta tank or powering an aeration stone in a 50-gallon community, the logic is the same: you need a pump that is reliable enough to run 24/7 and quiet enough that it doesn’t … Read more
Updated 20 June 2026 I believe your time is better spent enjoying your fish than carrying heavy buckets. If you’re still using the old-school manual siphon and a prayer to drain your 50-gallon community tank, you’re doing it the hard way — the right water change pump for aquarium use turns that 2-hour chore into … Read more
Updated 16 June 2026 When it comes to anything, I believe in using the right tool for the right job. While I’ll always tell you that a Liquid Master Test Kit is the gold standard for accuracy, I also know that life happens. Sometimes you just need a 30-second ‘sanity check’ to make sure your … Read more
