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Peppermint shrimps worked for me. Aiptasia X, lemon juice, hot RO, all that works but there's only so much you can do/see/access with the syringe. A predator will be on the hunt round the clock, and IMO, the only way to get them all.
If you don't mind a temporary float box or something...
Pasted below from some reefing blog. Even if the skimmer isn't pulling any waste out, it's still developing that biofilm.
When acrylic is manufactured there is a film left behind on the acrylic that while harmless, does not lend itself to good protein skimming. As this film goes away, the...