I am going to get a fish tnak. I am deciding between a 10 gallon for $50 or a 20 gallon for $80. The stand will cost $60 only if I get the 20. I have a stand for the 10 gallon. SHould I bite the bullet save up a bit and get the 20 gallon or buy the 10 gallon and save. I am going to use this for breeding.