Straight answers to common questions
Every guide takes one real question and gives one clear pick.
How to Set Up Your First Aquarium (a Beginner's Step-by-Step)
Set up your first freshwater aquarium the right way — what to buy, the order to do it in, and how to cycle the tank before any fish go in.
Updated Aug 20, 2026
Where to Buy a Fish Tank (New or Used)
Where to buy a fish tank — all-in-one kits vs a bare tank vs used, and exactly what to check on a second-hand aquarium before you buy it.
Updated Aug 21, 2026
How Much Does a First Aquarium Cost?
How much does a first aquarium cost? A realistic 20-gallon budget — tank, filter, heater, light, test kit and food — with real price ranges.
Updated Aug 21, 2026
Aquarium Water Parameters Explained (for Beginners)
Aquarium water parameters for beginners — ammonia, nitrite, nitrate and pH, the safe ranges, and how to read them with a test kit.
Updated Aug 21, 2026
How Often Should You Do a Water Change?
How often should you change aquarium water? About 25% weekly for most tanks — but let your nitrate reading, not the calendar, set the real schedule.
Updated Aug 21, 2026
How Many Fish Can I Keep? (Forget “One Inch Per Gallon”)
How many fish can you keep? Why the one-inch-per-gallon rule is wrong, what actually decides stocking, and how to avoid overstocking your tank.
Updated Aug 21, 2026
Do I Need a Heater, Filter, and Light for a Fish Tank?
Do you need a heater, filter, and light for a fish tank? A filter almost always, a heater for tropical fish, and a light mainly for live plants.
Updated Aug 20, 2026
Where to Buy Aquarium Fish (Online vs Local)
Where to buy aquarium fish — local store vs online, how to spot a healthy fish, and why you quarantine new fish before adding them.
Updated Aug 20, 2026
Why Is My New Aquarium Cloudy? (And What to Do)
Why is your new aquarium cloudy? Usually a harmless bacterial bloom — here's how to tell the types apart, and what to do and what not to do.
Updated Aug 20, 2026
Where to Buy Aquarium Plants (Online and Local)
Where to buy live aquarium plants — local vs online, tissue culture vs potted, and how to quarantine new plants so you don't import pest snails.
Updated Aug 20, 2026
What Size Aquarium Should a Beginner Get? (Bigger Is Easier)
What size aquarium should a beginner get? Why a bigger tank is easier to keep stable, the best first-tank sizes, and what each one needs.
Updated Aug 20, 2026
NilocG Thrive C vs Seachem Flourish: Complete or Supplement?
Flourish is micros-only. If it is your only fertiliser, your plants starve — Thrive C is the all-in-one.
Updated Aug 15, 2026
How to Cycle a New Aquarium (Fishless): A Beginner's Guide
How to cycle a new aquarium the fishless way: grow the bacteria that turn ammonia into nitrate before adding fish. The steps, and what to test.
Updated Aug 15, 2026
Seachem Matrix vs Fluval BioMax: Best Biological Media
Seachem Matrix vs Fluval BioMax: both are excellent reusable bio media. Matrix has more surface area; BioMax is cheaper and universal. Which to pick.
Updated Aug 15, 2026
Best Fish Food for a Community Tank
The best fish food for a mixed community tank: one quality staple for top and mid fish, plus a sinking food so bottom feeders get fed too.
Updated Aug 15, 2026
Preset vs Adjustable Aquarium Heater: Which to Buy
Preset vs adjustable aquarium heater: an adjustable dial lets you tune to your fish and nudge the tank for treatment. Why it's the better buy.
Updated Aug 15, 2026
Best Fish Food for Picky Eaters
The best fish food for picky eaters: high-protein, aromatic foods in the right size that fussy fish actually take. Our picks and how to switch.
Updated Aug 15, 2026
Filter Cartridge Cost Per Year (and the Bulk Media That Beats It)
Proprietary filter cartridges cost $100+ a year per filter. Here's the real cost, and the bulk media that does the same job for pennies.
Updated Aug 15, 2026
Best Root Tabs and Liquid Ferts for a Low-Tech Tank
The best root tabs and liquid ferts for a low-tech planted tank: one all-in-one liquid plus root tabs for heavy root feeders. Our picks.
Updated Aug 15, 2026
API Master Test Kit vs Test Strips: Which Is Better?
API Freshwater Master Test Kit vs test strips: liquid is more accurate and cheaper per test; strips are faster. Which to use, and when.
Updated Aug 15, 2026
Best Budget Aquarium Light for Live Plants Under $60
The best budget aquarium light for live plants under $60: full-spectrum, low-to-medium light picks that grow plants without feeding algae.
Updated Aug 15, 2026
Best Water Conditioner for a Planted Shrimp Tank
The best water conditioner for a planted shrimp tank: shrimp-safe, pH-neutral, and it must detoxify ammonia while cycling. Our pick and why.
Updated Aug 15, 2026
Aqueon Pro vs Eheim Jäger: Which Aquarium Heater Wins?
Aqueon Pro vs Eheim Jäger: the Eheim is the recalibratable durability benchmark, the Aqueon Pro is shatter-resistant and cheaper. Which to buy.
Updated Aug 15, 2026
Sponge vs HOB Filter for a 20-Gallon Tank: Which to Use
Sponge vs hang-on-back filter for a 20-gallon: a HOB wins for most community tanks, a sponge for shrimp, fry and bettas. The deciding line.
Updated Aug 15, 2026
Best Water Test Kit for Beginners — Cost Per Test Compared
The best water test kit for beginners, with an original cost-per-test table: liquid vs strips, and which is actually cheapest per reading.
Updated Aug 15, 2026
Seachem Prime vs API Tap Water Conditioner: Which to Buy
Prime does more per drop and detoxifies ammonia; API is fine if you only need to dechlorinate.
Updated Aug 15, 2026
Best Aquarium Filter for a 20-Gallon Tank Under $50
The best aquarium filter for a 20-gallon tank under $50 — HOB vs sponge, and the recurring cartridge cost that decides which is actually cheap.
Updated Aug 13, 2026
Best Aquarium Heater Under $30 (and the Failure Mode to Avoid)
The best aquarium heater under $30 — the budget best-seller that works, and the stuck-thermostat failure mode that makes the cheapest heaters risky.
Updated Aug 13, 2026
Aquarium Heater Wattage by Tank Size — the Actual Formula
How many watts your aquarium heater needs by tank size and room temperature — the real formula, not a lookup guess.
Updated Aug 13, 2026