I've got a 20g tall setup as a clam tank. all that's in there is a crocea a watchmen goby and some snails. recently I noticed a bunch of aptasia none of it is on the clam but it's starting to get closer than I would like. can I use stop aptasia in this tank? I've used it before in another tank and it worked like a champ. I'm just concerned about any affect it may have on the clam. any ideas or suggestions?