Originally Posted by HD Blazingwolf
I am always surprised on this. unless ur drop checker is 5 dkh or 6 dkh. i don'tse how ur getting close to gassing ur fish with a green drop checker unless u have poor flow and no surface agitation
I had the false sense of security with the drop checker. The solution that came with it (from malady) claims to be 4 dkh. I should probably verify that at home.
I do have a CO2 titration kit that should be arriving today to be able to double check the CO2 every once and a while (morning/evening/etc).
Anyway, I have a very high surface agitation, even before adding the drop checker.
I think a number of things contributed to my slight gassing of fish.
a) turned the co2 on 24/7 on pH controller
b) reduced the lighting intensity from 4 to 2 T5HO 6700K bulbs
c) the mulm had built up quite a bit (I didn't realize it was so bad until I vacuumed yesterday)
The gassing was very mild, they just stopped eating for the most part (which caused more mulm to build up), stopped swimming around as much or as fast, and would occasionally have problems in the morning. Having some fish die and not being able to find the body probably didn't help either.
What tipped me off to the possible cause of O2 deprevation was when acclimatizing some full size rainbows, the fish would start gasping for air every time I added some water. When I added the fish they first swam around, then swam around on the surface, then stopped swimming on the surface. They were sucking the air/water boundary trying to get O2. I moved the fish to a 5gal bucket with primed water and they were much happier. Fish are now in a quarantine tank and I picked up an air stone. After about 90 minutes and the pH rose about 1/2 a point, the existing fish (cardinals, rasboras, corys, bn plecos) just came alive and were swimming happily, playing in the current (rasboras) and exploring everything.
I'm in the process of bringing the CO2 back up, turning the air down (and hopefully just running it at night) and generally get back to fighting the algae again.