small bugs

[squeeker]

WEll my tank has beens sitting with live rock in it for 4 weeks the levels are all good and was just going to put in a clean up crew . This morning I wake up and there is one small worm like thing stuck to the glass and hundreads of little bugs I can barley see stuck on the glass as well. Should I hang off in getting the clean up crew or go ahead. Are these things bacteria????