So last week my 55gal was finished cycling and I added some BA Tetras and 2 Firemouth Cichlids. They've been doing this week, so yesterday I added 5 corys and 2 Bolivian Rams. The two rams were doing ok yesterday, but come nighttime the one turned very dark in color and was sitting on the bottom. This morning and afternoon he's still moving slightly, but getting drug into the part of the filter that sucks up the water. I just finished doing about a 40% WC and these were my parameters before doing so: Ammonia 0.25 Nitrite 0 Nitrate 20 pH 7.6 kH 5 gH 9 Is there any chance this ram could turn out to be okay after this WC? Should I fear for the other one going eventually even though it's acting ok right now? Any help/advice would be appreciated!