How different are your water conditions between tanks? How big is the discus? For a small (up to 12 cms) fish I tick them in a litre yoghurt pot with some original water, and float it in the new tank. Tht equalises water. I also add bits (not very scientific I'm afraid ) of new water to progressively equalise water chemistry. For a sturdy fish, give it 15 mins, for a discus 30. At the end, net out and move the fish, dump the old water. This seems to work ok for my fish.
If you're going to change pH by more than .5, you're looking at a couple of days to do it safely - I've never hadto do this. For bigger fish, they go in a bucket, and I dump in 1/2 litres of fresh tank water, one every 10 minutes for 40 minutes. |