That's what I'm thinking. Just running filter floss in chambers 1 and 5. Have a carbon reactor ready and UV sterilizer also on the ready...well and my dosing pump on the ready but all off line lol. Gonna try the 4 month no light thing and have a 10g under the stand running for coral qt. I guess for now I'm just gonna let it do its thing....I've never had anything like that. Very minor bubbles during the first week or so and as I said it will rapidly fill with clear water and overflow if I don't shut it down when I change the filter floss. Could be the epoxy in your tank? I've seen people complain about skimmers going nuts with that stuff. Might have to just let it do it's thing until the chemicals clear out. Carbon in the filter chamber might help the process. That's crazy foam!