I feed diff amounts for 7 days. Then stick to the closest one (no food left by morn since I feed at night).
As for warm water, couple things w/that.
1, if the fish can tolorate high temps, it's a good idea to add aeration to the tank.
Of you can not get your temp down even w/no heater then daily water changes, diy chiller out of an old working mini fridge or freeze 2 liter water bottles and toss them in your sump (won't drop the temp very much but it can help. Dropped maybe 2 or 3* last time I did this on my 300 couple years ago)
Best way to know if any tankmates don't like the heat (IMO) is their breathing or if they are surfacing (if all params r good I would consider the heat is the prob)
As for my Ery Ery, I feed him every other day 3 massivore pellets and the day in between I feed just 1 MP