how do you move a clam once it attaches?

[Delphinus]

I don't think GSP will hurt the clam. But you'll know by observing whether it's bad, if the mantle never expands where it's getting contacted, then you know.

I'm with you, I don't like moving clams at all. I'd much rather reposition the rock its on then try to cut byssal threads. I'm sure if you get used to it it's probably easy, but for me, I find it's sooooooo easy to lose a clam that I'd rather not try anything that seems like I'm inviting it to happen.

Anyhow, if I was you I'd reposition the GSP if there was determined at some point that it's a no-no to let them touch. I think you can peel GSP off rock fairly easily. I haven't done it in a while so I might be remembering wrong but I know for sure 100% that it's easy to scrape off glass and to get to reattach onto new substrate (it's a bit of a weed anyhow, very hard to kill just by moving it).

HTH!