We lost the first algae eater. It just plain old disappeared from the tank. It didn't turn up in the filter and the tank has a top cover so we are pretty sure that Belle the Cat didn't get it.
Then we lost "Blackie" the guppy. Same thing. There one day. Gone the next.
Angie ended up floating at the bottom of the tank upside down just a couple weeks ago.
Last survivor was Rainbow. He disappeared yesterday.
Tank is now apparently empty. No idea why they died/slipped sideways in time. Ph is good in the tank and we were feeding them the recommended food from the pet store. Tank was cleaned periodically and the filter was changed weekly.
As for Betta fish... Have you been changing the water in the tank frequently? Most Betta tanks don't have an aireator or filter. You need to change a certain amount of water, about a 1/3, every week to keep enough oxygen in the water for it to breath. It also help remove ammonia from waste products/urea.
Fish are pretty to look at, but I think it takes a special knack to keep them alive.
The last betta I had (Pugsley) died at my sister’s house. I had let her take him because it was during the month that I was caring for the Old Dowager, and instead of leaving him alone in his little 2.5 gallon tank, she added two fiddler crabs and three tetras.
It was just too much stress for the little guy and he died. I was really upset over it, because I warned them not to add any fish but perhaps an algae eater.
Go figure. She had her 61st birthday on the 13th. Old enough to follow instructions.
I’ve had him about a year & a half. He’s been fine that whole time. It’s just the last few days. We cleaned his tank completely, even putting new stones down the day before yesterday. The last few days he’s suddenly changed, I’d been doing everything the same till then.