Hi - I'm a complete newbie so wondered if someone could help? My new
29G is still cycling. It has 10kg of living rock, 1" - 2" of pre-seeded
aragonite sand and a huge skimmer. Ammonia is low but not zero,
nitrites are quite high but coming down and I have just started getting
brown algae.

Over the last day or so my living rock has gone through a
transformation, loads of little creatures have started appearing, a
small leathery tube with a disc on top (we call it "mouth on a stick"),
hairs with pink tips and worm type things that extend fans to filter
the water. There are also microscopic translucent things free floating
in the water, but not many.

I worry that the filter feeders will have nothing to eat as I am adding
nothing to the tank and the water is perfectly clear with nothing
obvious floating in it. But if I add food I worry that I'll overload
the tank and the cycling will never end or completely crash. Will the
little guys be alright?

Thanks for any help you can provide.