Good morning, I'm looking for some help here as I cannot figure out what is going on. I'm in the middle of a fish kill that has hit 3 of my rasboras, three cores, a peacock gudgeon, and about 7 neons. I have made some changes to my tank recently, but I don't know what those changes would have caused a problem. Here's some more info:
ph:8.2 Ammonia:0 Nitrite:0 Nitrate:10-20PPM. 75.3 degrees. I've already done one water change.
In an effort to get more CO2 into the tank, I switched out my atomic in-tank diffuser for an in line diffuser. However, I've not seen the drop checker change from blue. I upped the bubbles some a few days back, didn't see a change, so I dropped them back down. I even changed the drop checker fluid thinking that was the culprit, but still no change. Still blue.
Because CO2 was coming out of my Eheim spray bar, I pointed the out put down more instead of up. I obviously lost my oxygen exchange, so to counter that, I pointed my circulation fan up to get the ripple back. I was afraid that leaving my spray bar pointed up with an in-line diffuser would waste CO2.
I changed the tubing on my Eheim filter to some vinyl tubing from out at Home Depot. (As I write this, could this be the culprit?!?!?!?)
I removed a piece of drift wood I had in there and replaced it with an artificial ornament. This was done 3-4 weeks ago.
I dropped in some new plants including a moss ball about a week ago.
Here's what I've done to try and help the situation:
Added an airstone for a few hours last night. I noticed a couple of fish spending time at the top of the water and wondered if there were getting gassed out by the CO2.
I removed the inline diffuser and put the in tank diffuser back in on 1-2 BPM. I also pointed the spray bar up again to get good surface agitation.
If someone could please offer help, I would greatly appreciate it. I'm really at a loss. I hadn't thought about the tubing until I started writing this, so I'm going to change that out now as well.