I think you are going to need two 55-gallon tanks pretty soon. I don't think a 37-gallon is going to cut it for your reds and once the spilo reaches 10 inches it will need more room that the 37 can provide. You upgrade and then sell the smaller tank. Not a big deal.piranha 13 said:well i can't upgrade no matter what. I'm not allowed to get anymore tanks until I get rid of one.
Judazzz said:Removing all the tank decoration will not make the tank any larger: the little extra swimming space you will gain can be dismissed as unsignificant. A 10" fish needs more than a 12" wide tank to move around freely, and swim around savely, without the constant possibility of crashing into the tank wall when it gets scared or agitated.
Also, removing it will probably make your fish unhappy as well. I noticed that piranha's, no matter if they are skittish by character or not, are more at easy in a decorated tank, which the possibility to hide if they want to.
Ergo: don't buy fish you can't house properly!!!