![]() The way it works is that fish pull oxygen from the water. One of the biggest factors is surface area. There are a few factors in determining tank size. Don't be afraid to visit just to write down names to look up at home.ġFor reference, here is a site with a list of tank dimensions based on their size in gallons/liters: Then be sure to look up how large the fish grows to as an adult, and if it's a schooling fish that will require tankmates. What you'll really want to do is look around at your local pet store, and see what fish they have available. I would personally turn it into a nano tank with some plants/moss and some shrimp. You could probably get a betta for the tank, although in my opinion a 2.5 gallon tank is still a bit small for them. I would take the fish back to the pet store, they should have no problem with you returning it, although they might only give you a refund if it's been within a certain time frame. Goldfish are active swimmers so they need to be able to swim back and forth as they feel like it. Most tanks, aside from a 40g breeder tank, are only 13 inches deep, meaning the goldfish wouldn't be able to turn around without bending its spine too much. This means that for a tank to be big enough for a goldfish, you pretty much need to be able to wave a 2.5 gallon tank around the inside of it. To put this into perspective, a standard 2.5 gallon tank is usually only 13 inches long 1, although they can be shorter if you buy a special kit. They will easily be at the upper end of the scale as long as you can keep them alive. You didn't say what species of goldfish you had, so I'm assuming it's the common comet goldfish that all pet stores sell. With the exception of a few show goldfish, which will only grow to about 10 inches in length, an adult goldfish is going to be about 14-18 inches long. Jestep has a good answer, but sometime it helps to be able to visualize things. In our aquarium club it's probably a weekly or bi-weekly event that someone shows up trying to keep their tank alive because petsmart or petco sold them a setup that was impossible to keep going, or even get established, and they've lost all their fish multiple times as a result. Petsmart is notorious for employing untrained people in their aquatics departments, and they routinely sell customers fish and aquarium setups that are impossible to maintain. Cycling a tank typically takes around 4 weeks and is complete when ammonia and nitrite can no longer be detected in a tank, while nitrate is detected and stable or rising. ![]() This bacteria is what actually filters the water in any fish tank, beit freshwater or saltwater. ![]() Cycling is the process of building up beneficial bacteria. An aquarium must cycle before it is ready to house fish. ![]() ![]() If you take a fish tank, regardless of the size, and just put water and conditioner and fish in it, most fish will be dead in about a week due to ammonia poisoning. They're very messy fish and even in a small but suitable tank, owners often have major water quality issues.īefore you get another fish, read up on how to properly cycle a fish tank. Your typical comet goldfish will need at least 30 gallons of water each to stay healthy long term. That's realistically the only fish that can survive long term in a 2.5 gallon aquarium. ![]()
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