This is probably a silly question,

but I purchased some Blackwater Extract for my tank but now I'm not sure if it would be good for all the fish in it. I have 2 angels, 2 opaline gouramis, 2 kissing gouramis, 2 pearl gouramis, 2 clown loaches, l sailfin gibbiceps pleco, 1 albino aeneus cory cat, 1 elegans cory cat and 1 emerald green cory cat.
Once again, I appreciate your help!
PS: I don't know if it makes a difference, but since our move, my e-mail has changed from dander2 at cox-internet.net to the following: dander2 at sbcglobal.net.
Thanks.
Deb
*I edited your email addys so that they are safe from spambots, the change in address should have no effect at all.