i was thinking of adding some bristle worms as well?I have a 63L and my tank has done wonderfully with a Stomb snail and two hermit crabs. It is a simple CUC, but it is effective nonetheless. The hermit crabs have an insatiable appetite for GHA and the stromb snail stirs around the sand bed nicely!
I like them too.For a nano go Nass snails.
I doubt you'd ever be able to prevent introducing bristleworms into your tank unless you have just those faux corals Majestic Aquariums have in that huge display tank of theirs.As for bristle worms, you will get those as hitchhikers when you buy coral - assuming you are going to keep coral :)
Well I'm defiantly going to be add a blood shrimp or sexy shrimp at some stage once my fish are settled in and I'm not sure on adding anything like turbos that will breed and consume the tank lol going to be having a small inlet/outlet that could be risky.My favorites for nanos
Snails - Turbos, ceriths, nass
Shrimp - Peppermint, redline, blood, saron, sexy, emperor
Others - Brittle stars ,Micro urchins, yellow foot hermits, bristle worms
Trick is to keep them small, whilst strombs are amazing at keeping sandbeds clean they are bulldozers and will knock every frag over on the sand bed, run out of food and make their way onto the rocks and do the same thing, trochus snails can be great in big tanks with big corals but same deal, star fish, larger urchins, sea cumbers and so on all face the same issues.
You could run a complete CUC with just turbos and brittle stars and get out of the whole exercise for $25 but if you want to add interest and have lots of diversity just stick with the small stuff and maybe a star of the tank like a redline or if your budget is cheaper a saron