I don’t know why they disappear, but the reason they die is because you have too many fish in a 6.5 gallon tank. Does it have a filtration system? Six glofish by themselves is kind of pushing it, but with the two tiger barbs (I assume that’s that you mean) and crabs the water quality is probably suffering.
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Maybe there’s a wormhole in your fish tank.
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Some of the fish are time travelers.
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You are confused.
I appreciate your replies and suggestions.
Some people are a little confused on the number of fish. I started with 6 glo fish, 2 tiger barbs, and two very small fiddler crabs.
One crab did kill the other and one tiger died as did 2 glo fish.
At times my tank may seem a little crowded . . . when all the fish are there . . . other times, like a couple weeks ago there were only two glo fish, one barb and one crab . . . not so crowded!!!
The is no filter only a bubbler. There is no place for them to hide there. No place to hide in the two plastic plants at live in there.
I’m not confused. I can count and am able to observe a tank with fish it and count them since it doesn’t go into the double digits . . .
I . . . oh to hell with it.
OK, so by my standards four glofish would be the limit for a 6.5 gallon tank. My betta shares a 12 gallon with a population of snails which I keep in check by occasionally feeding some to the clown loaches in the 100gal. I have kept a single betta in a 6 gallon bowfront (much more lateral space than a cylinder) but felt it a bit small once his swimming muscles built up.
And really, that’s still not quite fair because danios are very active fish and need a lot of swimming room. Even one needs a larger, longer tank in order to get any real exercise. It’s like if I put you in a 10x10 cell, never letting you out, and then justified myself by saying it had really high ceilings.
As for the mystery, my guess is dead fish + surviving baby. Babies could be laid in/near the bubbler, and survive in there to a size large enough to fool you. Glofish (Glowfish) - Genetically Modified Zebra danios I checked it out, and glofish apparently do breed true, so that’s probably your answer. They are certainly laying and fertilizing eggs regularly, so if you haven’t seen babies that means most of them are being eaten.
I had two glofish go missing just today. 20 gallon tank. I moved all the tank decorations and searched the tank completely - they were nowhere to be found. They reappeared 3 hours later!
I can only assume that they burrowed into the gravel and were hiding there. I suppose the filter is a possibility, but I doubt it.