Thanks Storm and all for the welcome, will be asking questions
Cockils are sea snails, dunno how else to explain them, when they go into their shells they have a rough white disks to protect themselves.
Oh, what do you call them?
hey welcome to MASA dude. send us a pic or two of your system. it would be great to see. Pitty about not having a sump they add so much to your filtering ability and thus stability of your tank. But lots of ways around that anyway