Best idea for ridding the tank substrate of brown algae is getting a Dragon sifter Goby/Brownbarred goby. They sift all day and keep it stirred up. I have 2 tanks, one with tap water, one with RO
. The one with Ro
gets brown algae only on the sides of the tank, and thats only after like 2-3 weeks and its only in very small patches. I run a Coralife compact on it and leave the lights on for probably 8-10 hours a day and only have to scrub with a mag-float. The tap water on the other hand...that gets brown algae everywhere. I am always scrubbing it. Your probably wondering why not just use RO
in both right? The area the one with tap water in evaporates the water very quickly, much faster than the other tank, so i have to top it off every other day or so, and i don't have alot of room to store water so i keep a 5 gal
bucket of RO
for the one tank with the LR
in it and let the Dragon Goby sift the sand to death. It's just easier to use tap in the other one, i have to fill it so often it'd take numerous trips with buckets during the week to keep it full. Really just a convenience issue.