I really think your nearly there Erk youll have it sorted in no time. As a guess, Id say you just need to whoosh up your co2 a bit more, but you obviously have very sensitive fish in there so your right to be cautious. When you get the drop checker setup nicely thatll remove the rest of the guess work that your being forced to use now.

The biggest mistake I made was trying to over complicate things by testing and inventing reasons in my head! Tom and the team taught me to go right back to basics because it was nearly always the case that Id missed something. It was one of the best lessons I learned.

Your doing everything right, as much as you can until you get your purchases make sure your lights are low until your sure your firing on all cylinders, then you can turn the light back up, dial in the Co2, and watch your tank fly, which Im sure it will