Starting Nano Tank

[Rumika]

We have just started a 29gal Nano tank. Bought 37 LBS cured rock. It's been cycling in the tank for a week now. We added 2 hermit crabs and 3 snails. We have just been noticing live organisms in the rock and are wondering if they are good creatures or not?
They look like centipedes, long with lots of legs and look furry. We have no fish yet, so I am thinking once we add fish they will probably eat them.
All levels have been good. Thinking about possibly adding a fish this weekend.

One other thing i have noticed is it looks like a BTA. Very small and white. In the morning when no lights are on it is open and extending. When the lights come on it closes up for awhile then it will open up again. Any recommendations on what i should do or a better placement in the tank and will it grow to be a larger size?

Any thoughts on thse creatures and the BTA are greatly appreciated.

Thanx again. I love this site, there is so much good information and everyone is so willing to help one another.

Rumika