My small fish keep dying, is it because of my catfish?

[Grant A]

My small fish keep dying i.e. tetra's and guppies.
i have a small bristlenose catfish and wondered if that could be the reason. I lost a few fish previous to adding it, but have lost around 4 or 5 now and a little worried as they are dying 1 by 1 and not in groups.
Can someone help me please !!

[sonic p]

I would put the little fish in another tank until they get big enough so the catfish can't eat them. Idk im just suggesting this
Good luck with ur fish

[Belly B]

Use a flashlight and direct the beam at the fish, if you notice any extra spots or strange films covering it then it might be parasites or disease. If the fins are ragged and torn like they went through a fan then thats just fin rot.