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Do you ever see any polyps coming out of the tubes? If not, they could be dead.
Those hydroids could be chipped off I think, they don't look deep. then a dab of putty and glue. Ive won back worse rocks than yours to worse hydroids. Of late, when I can get the rock out, I use a flat screwdriver or chisel and lightly scrape the appy off the rock. The rock is soft. with gloves a carpet knife works. Normal stuff, nobody warns us about when we start.Our tank is not off to a good start, thanks to doing no research & getting some awful advice from a LFS rep. We started our 32 gal biocube with 2 clowns, a cardinal, 5 snails and 5 hermits, 20 lbs of live sand and 30 lbs of live rock. We are now the proud owners of hair algae, aiptasia & colonial hydroids.
Those hydroids could be chipped off I think, they don't look deep. then a dab of putty and glue. Ive won back worse rocks than yours to worse hydroids. Of late, when I can get the rock out, I use a flat screwdriver or chisel and lightly scrape the appy off the rock. The rock is soft. with gloves a carpet knife works. Normal stuff, nobody warns us about when we start.
Hair algae is pretty easy too in a tank that small. Unless its bryopsis. But Im wining that too a bit.