I'm getting really frustrated at the moment with my new 85G (Thought it was 90 at first but the dimensions calculate 85G). I originally bought it with the intention of having Angels but 7 weeks later I still have no angels. The tank came with a single Rainbow that I took from previous owner who didn't want it. I thought I'd get him some mates first as Rainbows are schooling fish but thats where my problems started. 3 new Rainbows were added when tank finished cycling (seeded from my other tank). I noticed when I got home that one of the new Rainbows had a lump protruding from its body that I didn't notice in the store. Foolishly I just let it go to see what would happen. 2 weeks later there appeared to be no problems, that is, lump stayed the same and everything seemed fine with all fish so I bought 3 coreys then another 3 a week later. I then noticed that my Rainbows were developing what appeared to be cotton mouth! Also one other Rainbow had a round red mark on its body. I took both Rainbows (one with original lump and one with new red mark) back to LFS for help. The owner confirmed cotton mouth and said it looked like they also had some form of fungal infection. He gave me 20 tablets and a bag of salt to treat my tank. Not sure what the tablets were but he instructed me to add the salt and tablets in two installments 3 days apart. Well it's been a week now and the cotton mouth appears to be getting better (wasn't that bad to begin with) but the lump has not improved at all and the red mark on the other rainbow has turned into a pimple looking sore. I know Coreys don't like salt which is probably why 2 died a day after adding salt as the rest of water parametres were normal. So now I don't know what to do. I'm going back to LFS tomorrow. Does it sound like I got good advice and should I continue to do what the LFS owner says or is he way off? All of the rainbows behave normally and eat fine. They don't appear stressed. As for the remaining Coreys they seem ok but they are quite still most of the time. Not sure if that's normal. Oh and to top it all off I transferred a Gourami from my 20G who was getting bullied and she was thriving but yesterday I noticed she had three tiny black dots on her body. From what I've seen in pics it looks like it could possibly be intitial stages of Black ich!? Appears very happy and healthy though. Argh!! I'm so frustrated and don't know what to do! Please help.