I have two Banggai cardinals in my qt tank, purchased them last Sat. They looked ok in the shop and were ok for the first few days in qt but they are now both gasping at the surface and are drifting around with the current. I have checked the water, ammonia and nitrite are 0, nitrates are 1, oxygen is 8ppm, ph 8, alk 9, temperature 25c, salinity 1.025. I've added an air stone but not made much difference. I have been using seachem stress guard from day 1 but stopped now as I wasn't sure if that might have been causing the problems. Just noticed last night that one off them has just started to get ragged front fins so I have dosed some seachem paraguard. No other visible signs of illness.
Any ideas what could be wrong with them?
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