I've been running diy co2 on my 5 gallon fluval spec planted tank. It had 11 cherry shrimp and two tiger shrimp in it. I've had the tank for about a month and have had the two tigers in there for about two weeks. Last week I added the cherry shrimp because I wanted more color and there were no more tigers. Everything was fine until last night. My co2 has lowered my ph to about 6.5 and out of the tap it is 7.5-8. To avoid a huge ph swing I left my co2 on over night but last night I didn't put the air pump on. In the middle of the night I need some light in the room so I turned on their tank light to see no shrimp in sight. I keep looking and notice both of my tigers dead. All of the cherry shrimp were up at the filter overflow thing. Two were inside on top of the foam. So I freaked out and turned the air pump on and tested the water. Oh was a little bit higher but it did have about 50ppm nitrite. Before all of my levels were zero. So my question is what happened? Was it too much co2? Not enough oxygen? What caused my nitrite spike? Any help is appreciated so I don't run into this problem again.
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