In my 10gl (glass) I take a little pinch of sand and rub it on the GSA and it comes off super easy and super fast. And then it leaves the crays a little alage to pick at in the sand.
I've never messed with acrylic so no idea if this will hurt it. Just my 2 cents.
If you take the advice, you'll note the long term "cure" is in there.
Do that. Cleaning it then, is no longer much of an issue.
Good use for a credit card anyway, better than what they are made for
GSA is pretty easy to control and not deal with.
Regards,
Tom Barr
I say leave it there, and tell everyone you saw it in a Takashi Amano tank.