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Based on the fish in your community tank this is a bit of a puzzler. I'm sure you have a top on the tank and neons are not known as 'jumpers'. Your guess that one could have died and been eaten is a good one but for this to happen to two of them in so short a period of time with no visible remains is unlikely. Now we have to eliminate everything else and whatever we are left with is what must have happened. We have to be like Sherlock Holmes detectives. I can only think of one other possibility but you will have to pin it down to determine if it's correct. They must have been eaten BUT you would have to have pretty large glofish and the neons would have to be pretty small. Of the neons that were eaten, were they the smallest ones AND is one or more of your glofish big? Do you ever notice the glofish chasing the neons around? This is the only thing I can think of. If this is it, your solution at this point is to make sure (if you replace the neons again) you get big full grown neons. They are (generally) more expensive but they will be too big for the glofish to eat.

Good luck.

I too have had a filter suck up a small fish and deposit it in the filter's tank. You may want to look in your filter carefully. However if it isn't there, my bet is the fish died or got sick and the frog or catfish ate it. It really does not take long for a hungry fish to eat a tankmate.

well, all the fish you have named can't eat the neons in one piece and i don't assume that they're all dying instantly, as soon as you purchased them. so i'm guessing that your filter might be a little to strong and sucking them in?? neons also aren't known for their lleaping abilities either so check for them in the filter, that's the only logical explanation for this.

Hmm..Well when my family had neons they always kept disappearing when there were other big fish around, it's possible they could've gotten eaten, even if you do feed the tank twice a day.

neon tetras always get eaten by the other fish, i got six once and as soon as i put em in the tank about 4 disappeared

It is possible the frog is eating them.

they got eaten by some fish, try observing the tank.

did you check in the filter maybe it got sucked up in there