My tank is 4 months old. I don't want an Anenome but I would like something... for my 2 Common Clowns. I don't want anything that will eat my other creatures or anything that would go into the media (skimmer/Filter etc..) or if it dies would cause harm to anything in the tank.

I have:
2 Cleaner Shrimps
2 Common Clowns
Turbo Snails
Hermit Crabs
1 Red spotted Flymo Blenny
1 Royal Gramma
AND
1 Tuxedo Urchin

What would you advice me on????

You could try something like a long tentacle plate coral, but they can be aggressive with other corals so need to be away from them, and require a soft flow area,

It's a fish only tank so we not got any corals.

What lights are you running on your tank, ie wattage how many & T5 or T8s,

They are T8's at 30w. Marin Blue and a Marin Day so not fit for corals, Don't want corals anyway hence why i've not changed the lightening other wise i'd have T5's. Everything in the tank is doing good and the clowns are spawning, I've got babies from hermits and snails or thats what they look like under a magnyfying glass, but they are getting bigger.

Water tests are as should be, not had any problams what so ever with the water from the very first moment I started it all.

You could say I eat, sleep and breath the tank, lol.. all though i'm still very much learning.

I know when we move house (when ever that will be in a year or two), I shall be getting a much bigger than with better lightening etc... and try my look with corals. But until then, was just wondering what will easily work for the Clowns in somewhere, where they can call their "pad", which won't do any harm in the tank or to the other things in it. And if there is nothing I can add, so bit it and i'll wait till I get moved. The fish are happy or seem happy with out having a "pad" of their own.