It looks like aitasia, best to get rid of it now before you end up with tons of them. Squirt a kalk paste solution on it with a syringe and it will suck it in and disappear. You have nice looking set up! The foam filters you have in your bubble plates may not be a great idea unless you plan on cleaning them out every few days after you start stocking your tank. Organic material will build up in them and start to rot causing nitrate problems. The plates themselves should be enough to get rid of the bubbles without the foam.
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