Brian Murphy
Member
Over the past 2 weeks I have had fish dying on me and not showing any signs of illness until I see them dead the next day. It is a Hi-tech tank with Co2 injection but I have ruled that out as the fish would show stress if they where getting too much. I did run out of Co2 at the start of December and with one thing after another during the month I never replaced the Co2 or done a water change for about a month and it was just after doing the water change that they started dying off. I bought 4 SAE to clean up some BBA and 3 died within 2 days before the water change and so I decided to do the 50% water change and start the Co2 again but ever since then plus one more weekly water change neons mainly plus some ottocinclus and 2 denison barbs have died. Some days I would find 5 or more neons dead and then days when none would die. It is just random and I get no indication that they are ill. Here are my theories but if anyone else might know please advise.
1. Water parameters have changed i.e. water from tap has added extras over the xmas period
2. The 4 SAE had a disease and infected the rest (although one of the SAE is still alive after 2 weeks)
3. One of the Denison barbs is attacking the smaller fish (no visible bite marks)
4. Dodgy Co2 gas or contaminated gas?
1. Water parameters have changed i.e. water from tap has added extras over the xmas period
2. The 4 SAE had a disease and infected the rest (although one of the SAE is still alive after 2 weeks)
3. One of the Denison barbs is attacking the smaller fish (no visible bite marks)
4. Dodgy Co2 gas or contaminated gas?