Lately I've notice 3 snails that have no shell in my tank.  They range in size from one very small one to one that is just as big as all the others that I have in my tank.   Any thoughts on if they are new snail or are the loosing their shells (I haven't seen any empty shells laying around)?

I have a 30 gal with 150 metal haldiae 6500 k and one 32 w power compact 50/50 a 2-3" DSB with the lower 1 1/2 to 2" Utah oolitic and the above layer Live sand (can't remember the brandname) about 50 lbs of live rock or more a mechanical filter running at about 100 gph and one RIO powerhead at about 300 gph.  The RIO pumps the water right into the return from the filter. NO skimmer or active carbon used.  5 gal water change every 2 weeks.

Live stock is not mutch at all.  One leather I got at the last coral cutting seminar along with a SPS and some other soft coral I also recived at the seminar and one open brain.  One blue damsil and about 10 crabs and 10 snails.

All water tests are normal.  I'll post the results of my lates water test if I can remember to right them down.  I live in Springville so if there are any members in the south valley that would like to come over and see my tank any and all opinions or critasisams will be accepted.

(IS THERE A SPELL CHEK)