04-07-2014, 06:54 PM
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The smell may be from the additives, however, are you doing a gravel vac to remove mulm/detritus? That may be a possible culprit, although my money is on the ammonia lock.
As to the neons...there's a lot of debate there, as you can see. Fro the research I've done and observing other people's tanks and the fish in it's natural habitat...this is a fish that truly benefits and shines when kept in high numbers, and a ten gallon tank just isn't able to really provide that. When kept in numbers around 15-20 neons really seem to flourish. I'd really recommend viewing a video showing these fish in their natural habitat, they look gorgeous swimming in shoals of hundreds, even thousands.
It all comes down to the owner, however. There are no definitive lines in fish keeping, and the boundaries are always being explored. It's really up to the owner to decide (based on research), the space and numbers they are willing to provide.
As to your tank, you seem to have lost a lot of the cycle when your filter died (did you save any of the media?), so treat your tank as if it's going througha fish in cycle.
Daily water changes of between 50% - 75% will be helpful to your fish, and if you can get hold of some media from an established tank that can also be really beneficial.