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Welcome to NJRC, sounds like you are off to a good start. One thing I am concerned about is the tiny anemone, it may be apitasia, which if it is you will want to remove it ASAP. Try taking a pic so we can identify it for you.
I agree with Paul, its from your AC, dropping it down to 70 makes the unit work a lot and uses much more electric. If you have an older less efficient AC unit that is even more of an issue. How old is the AC unit??
I just did it a few weeks ago with no problems at all, the rock is back in my tank and clean as ever. Its just like when you dump chlorine shock in your swimming pool, after 2 days its gone...
Yes bleach as in clorox bleach. Use a 25/75 bleach to water solution and let it soak for a few days. After that let it soak in regular water for a few days and then air dry. Its as good as new. Chlorine bleach will dissolve away very easily after some time...
Steve, with the rock you took out, you might as well bleach it as your last step. I kid you not, they dont call this stuff the devil weed for nothing. Even after freezing and baking, it has a chance of returning. Make sure you bleach it...
Sid, for media I use this, you want the xtra coarse so it doesnt turn to "mush" inside your reactor.
http://premiumaquatics.com/aquatic-supplies/C-00531.html