Hi everyone,
Yesterday I changed the DIY CO2 mixture because I hadn't changed it for a couple of weeks because I am too lazy. After a couple of hours it started producing bubbles as usual. I noticed the fish at the surface so I angled the filter outlet at the surface to create some agitation.
At sometime past 4am this morning I turned the light on in my room cause I got up to go to the loo, and noticed all my fish at the surface on their sides all gasping and looking half dead. Amoung them were my prized Apistogramma macmasteri :tears: I immediately turned on the tank lights, disconnected the CO2, changed the filter outlet (an Eheim elbow) for the spray bar, and put an Eheim air diffuser in the tank and set the airpump to high, to create as much agitation as possible. The fish still looked dead, but after a while my Emperor Tetras recovered. The Apistos and all my other tetras and rasboras were still at the suface gasping, and some of the tetras started swimmimg and spiraling around as they did so. The Apistos had no energy and could bearly swim. I left everything as is, because mum wouldn't let me do a partial water change, and turned the lights off and went to bed, because there was nothing else I could do.
This morning when I turned the lights on, everybody had recovered and was looking well. The Apistos were chasing each other around and being cute as they usually do. But I have a few questions:
Even though my fish seem all right, has this ordeal made them permanently weaker?
Is it possible that they could have suffered brain damage from lack of oxygen?
Could they have suffered memory loss? (when I wriggle my finger on the surface of the water the Apistos come up and nibble my finger, yet this morning they got completely spooked by it).
Is there anything else that I should be doing to help them at all in any way?
Thanks in advance,
Joe