doesnt hurt, not necessary if you keep up with water changes that should suffice , if you want peace of mind (like i did) you can get an HOB or in tank , i myself went with hydor in tank skimmer , works like a charm and was one of the cheapest (with good reviews)
oh you never want to bleach rock or anything in your tank, the beauty of live rock is that it has alot of tiny little holes that absorb and provide a home to bacteria , even if you think that all the bleach is out it can and probably will seep slowly over time because its absorbed into the rock...
are you talking about the ones for the 10g ? if so i really liked it very well priced and very good lighting, i did not change the bulbs , right before it was time to swap them out i upgraded my lighting and tank size. would i reccomned it ? yes very much especially if your on a tight budget or...
takes time to adjust, how did you aclimate it,
also quit moving it around find a spot and LEAVE IT it will eventually open, sometimes corals take a few hours , sometimes they take a few days to weeks ,