90F isn't a great temperature to keep the fish at for prolonged periods, but they are fine at that temperature. 87F is where you want to see the temperature at when you have ich in the tank, so it's not too high.
LOL her heater malfunctioned, she aint keeping her fish at 90 on purpose
Platies like small frequent feedings. Vegetable matter is very important as with most livebearers. A high quality flake in part with some vegetable based flake and frozen foods should have them in good condition in no time. Just make sure the get lots of green (vegetable flake, peas, cucumber, etc) as this makes up a lot of their diet.Good luck with your platies, they are still one of my favorite fish.DrewEdit-Oh just noticed you said trio, and just a tip if you didnt know but platies will thrive with the ratio of 1 male per 3 females if not more females. You would be amazed how well they do with many more females than males. Just a tip.

this makes platies out to be a new species of Mbuna yes they can do with some veggie component, but dont go treating these guys like Herbivores..... brine shrimp, blood worm, white worm and daphnia (all frozen in my opinion) should all make up a good part of their diet along with a good quality flake. Platies dont go around grazing on veg in the wild (from what i been told, i normally get my platies from a dude who collects them in Mexico i think? I get either the wilds of F1s although i also topped up not long ago from LFS!!!!. Not knocking the advice around some veg component in their diet, but they dont "need" LOTS of greens.