Losing new fish HELP!
i currently have a high tech planted tank that I'm having an issue with keeping new fish alive after adding to the tank, dying with in one to days. i have tried everything from Drip acclimation, floating bad method, etc.. shutting down CO2 for days prior to days after. The kicker is the current tank mates (lemon Tetras, Corys, Neons, and couple Plecos) are doing fine and thriving. These fish have been the tank for over a couple years.
Current Tank Parameters
Ph 6.6-6.8 CO2 on or off
Ammonia and Nitrates 0
I have several tanks set uo from High tech to low tech using the same water source. I use city water and let it mature for a couple days, declorinator before using in water changes. Low tech tanks are fine and any fish i add to these tanks do just fine and don't die.
I have stopped using CSM +B and Iron hoping that wasn't the cause. no change. shutting down CO2 hasn't helped.
The fish seem to always die at night.
Could it be a CO2 issue?
to Much Flow stressing the fish?
Maybe a short with low level current the current fish are used to?
Need help.. This one baffles me. what do you think can be causing it?
I have lost all Harlequin Rasboras, RummyNoses, Vietnamese Mountain Monnows, and Cardinal Tetras during this issue. All four bought from three different LFS which would hope would rule out disease.
Thanks ahead for your input.