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I am not sure on the wormy things, going to have a look later see if I can find anything.
The frondy algae first picture 2nd post looks like Bryopsis, a nightmare to get rid of, I have some.
A sea hare will eat the shorter bits but the only real way to kill it is to raise magnesium to 1500 until it is dead. I am contemplating doing this myself.
I know my tank is probably too small but out of interest whats the minimum size tank for a yellow tang?
Also are all butterfly fish difficult to keep?
I was thinking for when I go on holiday. A friend is going to come in to feed but wont be able to top up etc