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I don’t know what it could be but I’d clean the heck out of it. Not worth putting ur seahorses in harms way. Why take a chance ,, most important thing is searsaftey n happiness all around wellbeingThey about the size of a new pea. What are they? Are they harmful? It is a seahorse tank.
I assume some kind of bubble algae. Took it out of tank, popped the bubbles with a wooden skewer and tried to get all the left over bits off, rinsed in RO-Di H2O and popped in back in and buried that part of rock bc some people say stop the light.