AP Plus Anti-Fungus ?

#1
Hi, I'm finally delurking here, lol! One of my Gourami's has white cottony body fungus so last night I added the AP Plus Anti-Fungus to the water. All the fish seem to be doing good. The fungus is still there but there has been significant improvement in his mood so I'm hoping this will work! My question is this: The stuff turned my tank water BRIGHT Green. I thought maybe it would gradually fade but it doesn't seem to be. Will it stay green untill I add carbon back to my filter? It's driving me nuts, lol...I had such a beautiful crystal clear tank & now it's green! My 3 year old thinks it beautiful though, lol! TIA! :)