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I recently got a new 55 gallon which I will be turning into a "blue" themed planted tank. (Blue platys, blue cories, possibly a blue pleco if I can find a l128, possibly an electric blue jack dempsey, neon praecox rainbowfish. . .) which is taking up the physical location where I used to have my 15 gallon. (Which has been my hospital tank off and on.)

Now I try to keep the hospital tank up and active, to keep it healthy. It is fully planted (At times densely planted) with java fern, a very active lily bulb, wysteria, and a goodly quantity of Duckweed. It also has a couple banded loaches enjoying the relatively high current, and digging through the substrate, and a bushynose juvanile on maintainance duty.

To keep the plants happy, however, it needs a slightly higher bioload. So I put some feeder fish in there. (about a dozen)

That happened to turn out to be endler's livebearers.

This was 4 months ago.

Endlers are a type of guppy. That breeds faster than normal guppies. Every 23 days females will produce a brood. They're ready to breed at 2 months old.

So today I removed ~50 of them from the tank. . . and sent them over to my 90 gallon.

My 90 gallon is my Cory/Rainbowfish tank. Now Rainbowfish are peaceful fish, but are VERY enthusiastic eaters. I recently observed some of them spawning in the tank, which resulted in a feeding frenzy.

As did adding ~50 squirmy little guppies to the tank. Ten of them bought it before they found the safety of the planted areas of the tank (my 90 is lightly-moderately planted) and are now huddling there in fear. Well, except for the big females and males who are too big for the 'bows to eat. . .

Well, you're not alone!
My big pond goldfish had babies very recently, I wanted to save some of the fry to put back in so I moved some to the Danio pond so the parents wouldn't eat them. Didn't know Danios were such voracious carnivores!! They all look quite fat today.

Feeding fish to predators is, indeed, somthing to do with care, not all at once - unless you want the feeders to have a sporting change

I'm afraid you will have to empty all tanks ever contaminated with endlers

If they survive, they survive. If not, well, The 15 still has probably another 50. . . (Yeah that means probably ~100 of the buggers in a 15 gallon tank! The water quality has always been good though.) I'll put as many as I can catch into the 90 next time I get an urge to catch some fish, but I suspect that Endlers follow boyle's law.

I'll put as many as I can catch into the 90 next time I get an urge to catch some fish, but I suspect that Endlers follow boyle's law.

If those 50 go into another tank like a 90, you may end up with 900 babies! My sailfin mollies followed no laws and showed me that every 28 days there were 50 more. I don't think it would have mattered if I kept them in a teacup or a public aquarium

Do you have a friendly fish store nearby? They may be able to help you out.

Oh, the bows ought to keep the Endler's honest. I know a tank full of tetras will. . .