hey can we use charcoal thats meant for fishtanks?It's good, and it is bio-char, and coming out of the scrubber (Carbon Filter?) should be OK to use, but straight activated carbon should be "seasoned". This vid explains why:
https://www.youtube.com/watch?v=ENaUiNiXslk&hd=1
Sorry to have asked that asinine question, but you wouldn't believe how many folks think they can just go out and get a bag of Kingsford!!!