So I'm relatively new to reef keeping we used to have a really big saltwater tank in our house but my dad got rid of it and I was like well hey I'd like to start reefing so I got myself a little ten gallon all in one unit and a decent light (not strong enough for hard corals rip) and setup my rockwork and sand bed and all that stuff. but then I was talking to my dad and he said I could put a hardy fish in there and maybe some coral while it cycles, so I did. now fast forward 2 months and I'll admit I let the tank slip a bit but I thought I'm switching most of the stuff in the tank anyways when its done cycling and now my ammonia and nitrites are at 0 so I think I'm ready to switch everything out. a 3 issues first though (this is why I'm making the post my b on the long backstory lol) 1) I have this really nice blue Duncan in there that I kinda want to take out while I clean the tank cause I'm a little nervous I'll do something to hurt it so what's the best way to take it out and keep it happy and 2) what's the best way to clean algae off the glass the rockwork and the back wall lastly 3) what should I do with the damsel cause I wanna put other fish in there and I know they can be territorial especially in smaller tanks. thank yall in advance