Hey all.

So my (tank bred) discus are in a 55 that until the last few days was hanging out around 7.1 PH. The smallest in the group was a little sluggish, so I've lowered it to about 6.8-6.9 and I'll probably go a wee bit lower. He seems to be doing much better now, actually, although it could truly be a coincidence.

My question is, can anyone lay out the best PH levels for various activities? Like, breeding, raising fry, what causes aggression, etc?

I won't likely be breeding soon but it seems good to know.