The water evaporates quickly because I don't have a hood just one of those hamster lids. I will fill it up today, as it is water change day. As for the Tetra, some people say five is the min, some six...I agree with the six as of now, but my tank is 105% stocked so there is not much I can do. The Tetra get a little nippy with the catfish during food time but that's about it. Thank you everyone.
5 gallon: 1 male VT-Alpha
10 gallon Community: 3 Peppered Cory Catfish, 5 Neon Tetra, 3 ADFs.
3 gallon: 1 male VT-Sub Zero