I have a 120g FOWLR and the rock has been turning brown with algae I have 100 snails (Astrea) I was wondering what else can I add to combat this issue. Thanks
How old is your tank? What are your water parameters and what is your water source? What is your bioload like and water change schedule? Equipment list? If the algae has been a long-term problem then adding more snails is just treating a symptom. If your tank has just finished its cycle, it's going through a normal diatom bloom due to high nitrates and adding tons of snails means that once the bloom finishes its course you'll have a die-off of snails due to starvation which could potentially crash your tank.