Tank is about 17 days old. Started with dr Tim’s one and only. Added some Australian live rock. Couple days after this appears. Ammonia is 0, nitrite is .5. A couple of chromis in the tank, doing fine. Salt is tropic Marin pro reef in RODI water. 0 TDS. Is it algae?
Also in my live rock, is this flower/mushroom thing.

Also in my live rock, is this flower/mushroom thing.

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