What caused this to happen?

bmk

New member
Hi
The tank is 15 months old, no problems running like a dream. I have a crushed coral substrate (1") that I vacuum every water change and about 30kg live rock. I have just bought a quarantine tank and wanted to 'seed' the filter in it so I washed some crushed coral that I had spare from the original setup (stored in it's bag) in tap water (about 2 cup fulls) and put it in a net bag and then the tank for a week, so far so good.

After a couple of days the bag was covered in red flat worms/pods/snails and about 4 small brittle stars, my question is, what is the attraction in the new bag of sand.

BTW I have never seen any red flat worms in the tank.

Barry
 
Is this a good or bad thing? LOL
If good repeat steps then place new creatures back in original tank and see where they go.
 
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