I need help with a near disaster
Last night before going to bed, I notice one of my Barbs hanging out at the surface. All the others were lying on the gravel. I quickly flicked on the light to see a horror. All my fish were either white or clear and looking almost dead. One of my grouamis was stuck to the filter intake gasping.
What seems to be the problem is that my timer for my airpump did not click over and about an hour after I clicked it on, everyone was recovering.
Here is what I want to make sure of.
While turning on the air seemed to help things, I am not 100% sure it was the problem.
I can eliminate any toxins because my other tank was ok.
WC was done 48 hours before this happened
Fish were OK before the lights went out
I am using DIY CO2
I made no changes to my setup
I have little to no surface movement
The thing is the fish went from OK to near death in less than 3 hours. I originally only ran the airpump for pH control and never thought of it as critical. At least it used to not be critical, but I will admit I have denser plant growth and a few more fish today in my 29g.
So what do you think. Could my DIY be putting out too much CO2. Could my plants use all the oxygen in the water in under 3 hours at night? Combination of both maybe?
Any thoughts would be helpful, nut I does seem that they fish were suffocating.