I have removed all my fish from the main tank and qt them from a case os velvet. My questions are how long does the main tank need to remain fishless? and I have 100 pounds of live rock in my 150 and since removing the fish i have started to see a slight redish brown algae forming. i only have 5 hermits,2 porc.crabs and 4 snails. How many of each do I actually need to help out with the algae, I know I need more but I havnt had any algae untill removing the fish. Would it help to leave the lights off for the time being? tia