I strongly suggest the use of ro/di water you can use just R/O but will have little to none of phosphates it should have none! although will have silicates R/O only will not rid of silicates you must use a phosphate remover to do so. You only need 8 hours of lighting and a good skimmer venturi driven preferable! The best thing to use is a Sea Hare these nudibranchs only eat green stuff such as hair algea. The reson i say this is by pulling hair out of tank with your hands is that when you pull it you leave the roots of the plant the sea hare will eat it to the roots . You can find one or order one at LFS or you can order one as well the only down fall is if they have no greens they will die soon after from starvation so it's best to get one at LFS and make sure you can take it back most LFS will have a few just for this reason they pretty much just pass it around if you will.so some of the algae is leaving.. is it safe to pull out the rocks and finish removing it from the rocks and inside of tank?