I just bought 5 guppies 3 days ago, and put them into an un-cycled, 20 gallon tank, along with a bottle of TSS for a 40 gallon tank (because I heard, with TSS, a bigger bottle is better). The guppies seemed to be doing great for a few days, but now they don't look too good. One is losing color, and they are all developing red spots behind their gills (I'm assuming it's ammonia burn) I have a 20 gallon tank with a HOB filter rated at 90 gph Ammonia: about 1.5ppm Nitrite: 0 Nitrate: a bit over 40 Ph: 7.8 Temp: 79.8 F (I'm trying to lower it) They're swimming and acting mostly normally, but like I said, my green snakeskin guppy's tail is losing it's green, and all the fish have red spots. Because I'm using TSS, I haven't been planning on doing a water change, but if Ireally have to, I will. I don't know what to do.