orbit;3024882; said:If im not mistaken the Seachem is a chlorine remover. Same as Prime.. Not 100% on this but.
Nitrates at 20ppm will not harm fish. 50ppm of it will. Have him go to a local fish store to buy a few hand fulls of gravel from one of their established tanks. Tell him to put it into the filter cartridges (if filter is equipted with) if not just put it into the tank.
Or if he can have him buy a sponge filter, trade the new sponge for an established one with the fish store and set that up. It will cycle his tank properly in approx 48 hrs.
You are mistaken and probably would benefit by doing a search on Seachem's stability