Well, I tried to ignore it at first but it’s gotten too bad. I’ve got different kinds of algae growing in my 20 gallon mixed reef, and it’s starting to affect corals so it’s time to throw in the towel. I’ll attach pictures below, all algae grows back very fast. Frag plugs get little patchy algae that is hard to scrape off and some get longer stringy stuff that gets in between the polyps. I’ve tried hydrogen peroxide dip, it goes away but only for maybe a week at most. I have no cuc, I know that’s a problem but in the past all my hermit crabs, cleaner shrimps, and other shrimps all die on me and roll onto their back. Snails seem to live for a long time, I’ve got hundress of micro snails in my tank right now. I don’t see any type of die-off in the tank right now, bio load consists of one clown fish and a ton of coral. I have bio balls and use pillow fluff as a filter floss in the back chambers. Please help id and what can I do to fix this, I do weekly water changes around 5 gallons and do a ton of manual removal. It’s all back within a couple days! Thanks, anything is greatly appreciated. Bubbles are caught on some algae, I’ve seen this in pictures of dinos so that’s hopefully not what this is. The sand bed also gets a ton of matting algae, pretty much black or very dark green and I can pull it out in chunks at the end of the week. All my corals are growing good so I don’t want to do anything too drastic but still I want to fix this. Thanks for reading and taking the time to help!