You could, but if there are no other fish in there, I wouldn't worry too much about the temp. Just keep it the same as always. There are some that say if the tank is fallow of fish AND inverts, then you can raise the temp to 90-93 and 'burn out' and disease, but I don't know if that works or not.
Good advice from LFS huh? LOL it amazes my how much people just want to sell you something. I would not put anything in your main tank unless the bottle says it's reef and invert safe and then I would only do it if several forums have posted good things about it. I used Kick Ich in my main tank and didn't see any results in the 2 weeks that I used it. But I have used Chemi-Clean for a Cyano problem that I am having and I have noticed after 3 treatments that the water is crystal clear and my cyano isn't growing as fast. So some work and some dont I guess, but good judgement anywho on that LFS.
Your water levels seem ok, Nitrate is a little high, but not aweful.
If you wanted to, you could get some cleaner shrimp (skunk shrimp) and throw them in the main tank. They will eat any parasites and other nasties in the water that may infect the fish. You can suppliment their feeding with Krill twice a week and cyclopeeze every other day.