I found little red worms in my jebo 819 yesterday when i cleaned it, there didn't seem to be many and i crushed the ones i could see... they appeared to be alive but didn't move much. I havn't seen anything in the tank or fish and i do weekly gravel vac's. Plus I just changed the gravel since i moved the tank to a darker gravel (had white) which was cleaned well so i don't think there will be many in there and i didn't see any in the white gravel when i was scoping it out.
Fish seem fine, i haven't had any deaths in that tank for quite awhile and i havn't added any newbies for ages (i think)
ANY ideas on what these are and will they do any harm??
Should i treat the tank, if so what with?? or just leave them be??