How to keep GSP undercontrol

[kien]

This may be an expensive option but you could try smothering it with epoxy. If it starts to grow onto the epoxy then it'll be easier to peel the epoxy off and sell it as a GSP frag and maybe recoup some of the cost of the epoxy.

[Karsten]

Spend a hour and scrape it off with a razor

[pinkreef]

or you could put them in my tank, they disappear for me