Aptasia

[Hangfire]

Taking the rocks out of the tank sounds like a real pain. All of them are on different rocks, so it would mean taking out half of the rocks in the tank, and possibly killing all the other great stuff that's living on them - one of them has a great feather worm colony that's really grown in the last few weeks, plus a green sponge that just appeared (or I just spotted). I think I'll leave taking the rocks out as a last resort.