Hey guys my friend just gave me a small tank I think it's around 1 gallon or less. Obviously I can't keep any fish in here but I was wondering what I can keep without a filter or heating. I was thinking of just having a freshwater plant tank plus maybe one snail. I'm scared of the snail multiplying though. This tank is super small are there any tiny filters I could buy to give it at least some filtration or will the plants be enough?