8.4 is a fine ph
, don't sweat it. The problem is, if the only thing you used to cycle your tank was Cycle
by Hagen, you didn't cycle your tank. The product does not live up to it's claims and your tank is cycling now that there is a source of nitrogenous waste in the tank.
Take the clown back, get a raw shrimp from the seafood counter at your grocer and put it in the tank, it will break down and the waste will cycle the tank. For more info on this method, follow the link in my sig to the articles section and look for it in the SW