I waited to add otos to my tank until I thought there was a decent amount of algae, and they completely wiped it out. So what do I feed them now? I've been adding bits of algae wafer, but one of my corys really likes eating the algae wafers, so a lot of the time, he ends up eating it. So how do I feed my otos? Do I extend my photo period to try to cultivate algae? Just keep adding algae wafers? They tend to be slow eaters from what I've seen (at least slow at getting to the food).