Are you planning to cycle with these fish? The numbers don't look to bad for a cycled tank, but cycling with the fish will be hard on them. Also if your tank is cycled. Are you adding them all at once? This could raise your nitrates a lot.
Plant mass helps with the absorption of the waste. What plants and how many do you plant to start out with?
Also just a thought but why 3 or 4 SAE's aren't they great with algae at first and the stop eating and can become aggressive.
6 sids, 6 ADF's, breeding pr discus eggs always eaten, 1 oto, No Co2, Use EI, generic Excel, Eheim 2126, 18w UV, 96w 6700k raised 4" above tank (9hrs) 65g