I am relatively new to this hobby. (7 Months). I have 2 tanks. In my 55 gallon tank I have 2 kissing fish, 2 golden gourami, 2 swordtails, 2 silver dollars and angel fish. All the numbers are good. Zero nitrates and ammonia, 20 nitrates, 7.6 ph. For the last 2 days my larger kissing fish has been laying o the bottom. Yesterday he would get up to eat, but not today and now today the smaller kissing fish is also laying on the bottom. Did a partial water change the day before I noticed him laying on the bottom. Everyone else seems to be swimming around fine. I do not see and spots on them, so I do not think it is ick. The golden gouramis were just introduced 5 or 6 days ago. Any ideas on what is wrong?