Fresh Water Algae is very different to Salt Water. I hear about how thick Salt Water algae grows and it can be hard to scrape off. I have built a few scubbers for Fresh water and the algae is very easy to clean off. It's very fine in appearance and slimy. I have a hang on the back filter that I took the cover off and added one 23W CFL just to see what happens. The top surface of the sponge is 5 1/2" x 3 1/2". Seven days a go I cleaned the filter and added light. I have this same set up at work on my 15G and cleaning is easy. Take the whole filter to the sink to keep the algae from circulating into the tank. If you try to just remove the filter cartridge with the sponges/algae and media bag in it. The algae will break off in places and fall in the tank. To clean just squeeze the sponge under tap water and rub with your hand. It comes right off after a few rinses. I bought one extra sponge so I have one on the bottom then media and the Algae growing sponge on top. No bubbles have been added to this like the UAS.
Anyway here are a couple of pics I have for Fresh Water. I Do Not believe it will work with Salt Water because The algae grows thicker and is harder to remove... Fresh water grows slimy and very fine strings..
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