- is a 3d background ok? I was thinking of a crevice style from universal rocks. I have used that background before in other tanks. Or would a light blue painted background work better? 3d works fine, just need to make sure it is sealed so no detritus gets stuck
- Should I wait on adding things like driftwood until the discus have grown larger?
That is the ideal approach and one that I advocate.
- I was thinking of adding a group of cardinal tetras when I add the discus. Should I also wait on the tetras until the discus are established?
I don't think the timing matters, just be sure to follow quarantine procedure.