Discus

[mr.sam]

So after months of having problems with my tank from algae to PH to nitrate. I finally get everything right and my plants growing. Now I'm having a problem with a discus. I got it about a month ago. It's still relatively small to me but so for he has killed three other discus I have put in my tank. The first two were about the same size and in about 3 or so days they were gone. The last one was a lot bigger. I got it on Friday and now it's dead to. I've been checking my water on a daily basis. Water temp. 82, ph 7, no ammonia or anything. What else can I do. Gorgeous fish but it is about to get the boot

 

[xwing]

You would know if it's the discus killing the others first. Otherwise something is in the water temp needs to be at 82f and your ph is too high it needs to be between 5 and 6.5 don't try and cheat with discus they will die fast