i had a rubber lip, 2 goldfish 1betta all in a 5 gallon i tried a white rubberlip and also the common rubberlip after 3-4 day i would find the rubberlips lying dead at the bottom of the tank with all the fish eating out the stomach what do i do to keep them from eatting the rubber lips

Well if you remove the dead fish, that will stop them from eating them.

To keep them from attacking and eathing other live fish, seperate them.

Those fish are not compatible with each other.

Good luck

Jessica

Two goldfish and a betta are too many fish in the 5 gallon tank already unless those are tiny baby goldfish.

Have you tested for ammonia and nitrites?

I'm guessing that the rubberlip just died and became lunch instead of being attacked and killed by the other fish.

Those fish do not all go togther and they are so in a
tigh space a 5 gallon is not the best place
to have so many diffrent types of fish.
You should get at least a 10 to 15 to 20 gallon for your
goldfish.

(a tank for him self) and the 5 gallon should be for the betta.
unless you buy him another aquarium or jar.