The general rule is to feed what can be consumed in 5 minutes. If you think they are still hungry then you can add more. But for me I do not use that rule. I know my fish and generally what they are satisfied with. My Dovi's are not big eaters so I do not feed them as much. My Viejas seem to take a while to be satisfied so I feed them more. But it really does not have to be that technical.
150gal- Dovi's; 3 AC 110 P.Filters; 2 AC 110 P.Heads; Eheim 2217,2260
180gal- Managuense; 3 AC 110 P.Filters; 2 AC 110 P.Heads; Eheim 2217,2260; FX5
210gal- Argta,Bifsct,Fnstrtus,Maculcda,Regani,Syns,Zntus; 4 AC P.Filters; 2 AC P.Hds; Eheim 2250,2262; FX5