just a couple questions

[freerider]

Hope everyone is having a great weekend, just have a few questions. ove the weekend i have bought 2 mated clarki clowns and a red bubletip nem, which they have hosted very well. my tank is a 33 gal, running a fluval 304 filter, a reef octopus bh1000 skimmer, yata yata yata. my questions are, Ive been feeding them frozen brine shrimp which they have been going crazy for, but after feeding they still look hungry and are searching for food, i don't want to over feed, but i don't want them to starve either. how much do you with clarkis feed? my scooter blenny and cleaner shrimp also eat the stuff, ive been feeding about a 1/3 of the frozen cube a day.
also my parameters are all good, good at keeping my salinity 1.025, but temp fluctuates alot from daytime to night, due to my t5ho lights. they are as far off the water as possible with the given legs, but i could hang the light i guess also, during the day the water temp sits at about 82. during the night it sits about 78. if i get a small fan and just aim it between the water and the light should this help? im going to have to correct this for my nem. any advice would be greatly appreciated. My nem also moves around it seems pretty much around noon every day, it goes under a rock away from the light and closes up. My t5's couldnt be too bright..new to nems so trying to get all the information i can