Hi
If all you have in the tank is fish (no inverts, not lr, no corals, etc. Just fish), they should be fine without any big time supplements. All i have is fish, and i have never used any kind of supplements, and my fish have been fine, no ich, etc. Maybe other people have some other opinions, just to be on the safe side. Good luck- (p.s what kind of skimmer do u have, how much was it, whered u get it, and hows it working - thanks in advance)
The Dude