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Mesenterial filaments, part of the internal structure of anemones.
Excellent, thanks for the follow up. :)
Unfortunately the links are not the correct type and unable to few images. If unsure of a crabs intent or danger, it is best to remove them and place...
Welcome to 3reef If the clam is still alive it might be it's siphon. The foot of a clam does not have an opening so that rules that out, but that...
The are mostly nocturnal. Hitch hikers that come in on frags, corals, lr. Not uncommon to have them and not know it. Just google an image and compare.
Collonista snails perhaps.
How old is the tank. For cyanobacteria I always start with improving the surface agitation if possible. Check phos and nitates, even though I am not...
Things have certainly evolved and turned into a very nice tank, you should be proud. :-)
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