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The honest version. Size, what you already have, what’s stopping you.
Hub · Day-one aquarist
A tank big enough to forgive mistakes, a cycle that finishes, fish that survive month one.
Bigger water is more stable. Skip the 20 litre kit. For freshwater, think 60 litres and up if you can park it. For marine, start at a size you will still want in a year — not a bowl you will replace. Longer verdict →
Traditional tanks: cycle first, then livestock. That wait is real if you are assembling a box of water. A marine system designed to run as a whole is built so you are not sitting on an empty tank for a month as a personality test. Longer verdict →
Often for freshwater, after dechlorinator. Not as a blind habit for saltwater. Tap here varies by suburb — chlorine, chloramine, hardness. Test or use RO/DI for marine. Longer verdict →
Fish waste becomes ammonia, bacteria turn that to nitrite, then nitrate. Ammonia and nitrite should sit at zero once the tank is running. Nitrate you manage with water changes or a system that actually exports waste. Longer verdict →
Freshwater: hardy tetras, rasboras, corydoras — not a goldfish in a vase. Marine: clownfish in a proper tank, not a random fish off the saltwater wall. Longer verdict →
Less than the shop sticker. Count adult size, not the cute juvenile. One calm stocking plan beats “add another because the glass looks empty.” Longer verdict →
Freshwater: a regular partial change beats a rare huge one. Marine: top up evaporated water with RO or you’ll climb salinity; change water on a schedule, not when it looks grim. Longer verdict →
Usually a bacterial bloom. Don’t bleach the tank. Lights down, don’t overfeed, give it days. If it smells like death, that is not a bloom — that is a crash. Longer verdict →
Yes to both in almost every Australian home tank. Filter is the bacteria hotel. Heater stops overnight swings. A lid helps. Longer verdict →
The cheap kit is not the cheap path. Budget the tank you will still have in twelve months — stand, light, filtration, heater, water, livestock — or buy a complete system once. Longer verdict →
Living Oceans is the complete marine system we point to — cabinet, automation, clownfish.
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Skip the 20L kit. See the complete clownfish system.
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The honest version. Size, what you already have, what’s stopping you.