ARGH! I've had a really frustrating evening/morning. My 20 gallon tank turned into a mystery deadzone. Last night, I found one of my bettas dead - my red one - looking completely washed out - like a ghost - no signs of illness, no bitemarks - just dead.
I did a dip test - and had zero nitrates/nitrites - but the PH and GH levels were skyrocketed???
WHat would cause this? For the first month and a half, the PH was testing at 7.2- 7.4 and the GH was always 3 - 4 drops.
The only change that has occured on the tank is that I began a week ago to supplimental feed with lettuce for my otos. And, On Sunday, I switched to cucumber (I went shopping). And, I added the new Echeim canister filter to the tank on Saturday (which has given significant more water circulation - so I was able to shut off the koralia powerhead).
I decided to do a 25% water change (I needed to top off the tank anyway so it seemed prudent to change some) - and this morning, I found another dead betta! -
ARGH! and looking at the other 4 - the colored ones, at least - they all have stress stripes.
So I did the API tests this morning and the PH level is now back down to 7.4. No ammonia. no nitrites. no nitrates. - zilch.
The cories and otos are munching away. Although I removed the cucumber that was 24 hours old - this morning, and decided it was best not to replace it until I figure out what's wrong with my tank. There's sufficient algae still that's regrowing on the glass that the otos won't starve today.
I had to set up emergency homes for the remaining 4 betta girls though. I just don't trust the tank with them, especially seeing how stressed they're looking. I have 2 - 2 gallon 'Q' bowls - and I took the smallest 2 babies and they're in a breeder's net hanging in the 30 gallon tank with a ton of floaters around the outside of the net to protect them from too much pestering...
My King Betta male in that tank - His reaction thus far is to do a LOT of swimming around the tank and checking them out though... and some flairing... Definitely this is not an ideal fix.
When I woke up this morning, I had not intended to turn that tank into a sorority... now, I don't know what other options I will have.
How do I figure out what's wrong with my 20 gallon, and how the hell do I fix it???