OK,
I did the 30ish% water change on Tuesday evening and continued on another 5 day course of 12ml Myxazin and 40ml Pimafix. All was going ok until Thursday when I had to remove 2 tetras (1 x neon and 1 x black phantom) - no signs of anything again. I continued the course, the fifth and final day being today. Tomorrow would bring another 30% water change and I hoped that all would be OK.
Then disaster strikes again! A clown loach! My favourite! about 6" long. And I've got a siamese flying fox that isn't looking to good either - his eyes are clouded over and his fins are ragged and white at the tips.
After one of my clowns died, I feel a bit dejected but I still have many fish worth saving. Am I using the right meds? Is there something else I could be doing? I have a small air pump on 24/7 whilst the meds are being used, but I am still adding Co2 during daylight hours (on a timer 11-11). Am I suffocating the fish?
On another note, I've wrapped the small filter in a pair of tights which helps a lot. Thanks for the tip.