depending on your light, you could rest a a 1 or gallong jug/bucket on top and have it siphon down. I have my just on the chair next to my tank and it works ok
It looks like you have a lot of sponges and micro/macro algaes here and there. Picture 1 looks like a barnacles, some type of anemone, and a cleaner clam. It also looks like, in one of the last pictures, that there are some lps skeletons attached.
I have read that these guys are not from Florida coast which is where I got them. Everything is mainly sponges? What is the red one that looks like it is kind of stemming?
Also, number 3 it may be hard to see, but it looks kind of like a gel with lots of tiny white eggs or little dots in it.