How to get a bigger tank

So im struggling with money a lot rn, we can feed her good and treat her good, but the tank is an issue rn, anyways to make fast money or get a tank cheap? For the meantime I've beeb taking her out whenever she glass surfs.

So im struggling with money a lot rn, we can feed her good and treat her good, but the tank is an issue rn, anyways to make fast money or get a tank cheap? For the meantime I've beeb taking her out whenever she glass surfs.