If you get your discus from Hans, which I strongly recommend you do, and you want to start with 5, get them all at once (strains & sizes of your choice - it's a real plus to be able to select them all on site yourself, with Hans' help).I'm probably not getting the 90g unfortunately as I haven't heard from the person who has it, they will probably end up in my split 75, which is fine. Thank you for the list of what to look for. After reading and comparing I see what you mean now. I think once I can swing it Hans' store sounds like the absolute best option. How many should I get at once? Like should I get all 5 at once or wait a little bit in between adding a couple? Also, for filtration I know in a fully planted tank you can under filter, but since this would only be a couple plants how much filtration am I going to want? And what kind of current do they prefer? I would probably go for a rena xp3.
If your tank is lightly planted & decorated, you needn't be too concerned about filtration (overly strong filtration is not essential) - just be sure your tank is fully cycled beforehand. As for circulation/water flow/current, discus prefer light water flow so you needn't concern yourself with strengthening it.
Just do fairly frequent, large changes of fresh conditioned water, clean your tank well with each wc, and feed high protein foods (lightly) 2 or 3 X a day if they're 3" 'ers or so, and only once or twice daily if they're larger than that.
Good luck with your discus project, and don't hesitate to PM me anytime if I can be of further help.
Regards,
Paul