Fish Tank

Should I let my fish tank dry before returning fish and water?

I had a REALLY dirty fish tank, my dad and I emptied the tank, and completely cleaned it. Should we let the tank dry before returning fish/water/gravel to prevent algae, or are we just wasting our time…?
Thanks to anyoe who will help!! ^_^
Oh yeah, by the way, how many fish can I put in my 20 gallon fish tank?

Uh-oh…no matter how dirty your fish tank, you should NEVER clean it all out completely. You should only ever do partial water changes with a gravel siphon.

Your tank has beneficial bacteria growing in that de-toxifies fish waste, and by cleaning your tank like that, you’ve killed a lot of this bacteria. Most of this bacteria lives in the filter, however, so hopefully you haven’t cleaned this out. If you have, you have an even bigger problem. You need to read up on fish tank cycling ASAP. Unfortunately, you may still lose a few fish.

You should never allow your tank to become that dirty, either–it’s not good for your fish, and it’s not fair to make them endure poor conditions.

As to how many fish you can have, it depends on the fish. For example, you could keep one fancy goldfish by itself…or you could keep 20+ neon tetras. The adult size of the fish and how much waste it produces are the main characteristics to look at when deciding what fish to keep in your tank.

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