I purchased a used red sea reefer 250 a couple days ago. The tank is in awesome shape it's only a few months old there is no scratches or any type of defects. The only thing is that's it's pretty dirty, theres some green algae film on the glass and ALOT of dried coraline algae inside the overflow box and in the sump. I'm asking if theres any way to clean that out or if I even need to clean it out..? (Obviously I would clean the algae film off the glass) I'm mostly talking about the dried coraline algae. As you know the tank itself is very heavy and I definitely wouldn't want to turn it on its side or anything. Sorry for the long post but this is my first red sea tank and only my second saltwater tank I've ever had so I dont have the most knowledge about stuff like this any advice would be greatly appreciated!