Hello all, I have a relatively new 10g tank that Iíve had running for a couple of weeks and just added a danio and barb to the other day. I put in the fluval cycle when setting it up and followed the instructions for a new tank and for when adding fish. The barb died the very next day and the store tested the water and all of the levels were fine and the ph was 7.5-8 when I tested at home. So I got a few more danios and 2 barbs and after a few days, one died. I had noticed the barb was swimming downwards at an angle and now the danio i started off with and one of the new barbs are swimming at the surface.
I thought maybe they werenít getting enough dissolved O2
in the water so I removed some of the water so the water from the filter would ďwaterfallĒ into the tank agitated the surface more. Otherwise, Iím at a loss of what to do. Iím definitely not getting anymore until I solve this problem. Any constructive advice is appreciated!