Hello. I have had my tank for 20 years. 54 gallon corner tank. Currently 2 fish - maroon clown (6-8 years old) and Picasso trigger (2 years old). During the past 2 years, unfortunately I have neglected my tank. I have green hairy algae EVERYWHERE. Are the rocks save-able? Are they worth saving? I probably have 100lbs of rock. I have 60lbs of black sand as well. I know i will have to relocate the fish to a smaller tank, I just don’t know what to do to start. Can anyone help me? I have a skimmer and eheim cannister filter as well. Thank you!