How can you?

I don't know if you can stop them from growing, but you could just go in with a razor and cut them back to whatever size you want and sell the frags.
 
Yeah, pruning is really the only way to stop GSP once its rolling. The only think I have found that can deter its spread is competition. My RTBA is really the only think in my softie/LPS tank that has managed to maintain some breathing room.
 
In my tank, I've noticed that GSP likes to climb. If it can find a connection to a rock that's higher in the tank, it's more likely to spread to that rock. To slow down the GSP's spread, I try not to stack other pieces of live rock on top of rocks with GSP. Anthelia is another rapidly-spreading soft coral that I try to keep near the top of my tank.

On the other hand, this trick doesn't slow down Kenya tree one bit. Rather than spreading by contact, Kenya tree spreads by "self-pruning" its own "branches". (self-fragging? autofragging?) The branches drift in the current, then grow wherever they land.

I don't have an anenome, but I've noticed that Euphyllias (frogspawns/hammers/anchors) seem to hold their own pretty well against GSP.
 
Peel/remove what you can and treat the area with a kalk paste.

May need to repeat the kalking a few times to get the hardy stragglers - works with anthelia, xenia & sps as well.

Only think I've found that kalk doesn't really kill is aptasia... :hmm6:

-Eric
 
If I can't get it off, I cover it with epoxy. You can remove the epoxy after it's dead. Kalk will kill it but it may take several treatments.
 
If you employ a combination of the last two suggestions, you should get there. The spreading mat can be peeled off. It takes a bit of patience, and good pair of 6 inch tweezers. If that doesn't work, you can corral it with expoxy as suggested. Just apply it to the perimeter but don't mash it down. Give it some time and pull/pry off the epoxy.
 
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