I have 7 candy cane shrimp in my 75 gallon tank. I bought 4 snails yesterday and plan to add 4 more to deal with the red algae bloom in my 4 month old tank. Do snails really clean the algae? and my shrimp don't seem to clean anything! they seem to only forage for food. I guess those skunk cleaner shrimp are the only shrimp who actually clean. And what would starfish do for me? and do they need special lighting.