I noticed this small patch of growths this morning and as far as I can tell from searching google, maybe red grape algae? I've attempted to take a pictures with my phone but it's not the best quality. We recently had a bit of a heat wave in my area and the algae went crazy for about a week. Then I ran a cycle of red slime remover and kept my lighting off for about 4 days. End result-my Tank looks crystal clear and my algae is way down aside from these mystery growths.