Have you done a ammonia, nitrite, and nitrate test lately?
I have plenty of chaeto. I can send you some.
There are several sand sifting gobies that come to mind. I know some are royal pains because they take a gulp of sand then swim up and scatter sand all over. Usually on corals, but I think there are a couple that aren't as bad.
To clean off the rock, I like to use astrea's.
When I have a algae outbreak I will order a few more than is necessary. In my area they are relatively cheap at a $1 each or less in bulk.
I also like to use crabs. But only scarlet hermits. I've never had problems with them going after corals or fish. Those can be a little expensive, up to $5 each, and I seem to be able to keep snails with them in the tank. They will use snails shells if the opportunity presents itself.
Then there are different sand sifting starfish. I've never used them. But from what I've read they do work when they are small, but when they get bigger, some will go after fish.
I guess the secrete to them is to buy small and trade off later.