All I used when I cleaned the tank was stuff I believe is called Aquasafe to take out the chlorine. Do I just lower the ammonia from partial water changes? I do have the foam pad and the charcoal...but im not sure about the biomax filler...what is that?
It sounds to me like your tank has no beneficial bacteria to filter out the ammonia and nitrite, and as long as it doesn't your fish will die. Neons are very sensitive to this.
I did clean the sponge. The filter never even came with the biomax. I'm a little clueless as to where it would fit in though. How often should I change the charcoal bag? Thanks for all the help guys.
OK, by cleaning your sponge with chlorinated tap water, you killed A LOT if not all of the beneficial bacteria that may have still been lurking in it after sitting for so long. I strongly recommend that you return the fish to the fish store and cycle your tank following the directions for the fishless cycling in one of my previous posts. Neons probably will not make it through a "fish-in" cycling they're too sensitive. Get yourself an ammonia water test kit to add to the ones you have and start trying to get your tank to cycle. You must be patient, it will take some time to get your tank into proper order. If you don't do this any fish you put in will very likely have a premature death.
What I do for my filter (I learned it from people here), is unplug my filter and take the whole thing off to dump out the yucky water. Then I wave the sponge around in the last bucket of water removed from tank to get all of the solid stuff like algae and fish waste off. Then I put it back in the filter. I think charcoal is only good for about a month, but when you replace it you will lose some of the beneficial bacteria that is happily living in it. If you get the other biofilter media that is suggested and use that instead of the charcoal you shouldn't have to change it at all, and the bacteria happily live in the little microscopic pockets.