Hi,
A week ago. I was doing a water change for my 15 gallon tank and I found a dead/drowned cockroach in the water. I don't know how it got in or why? At that time, I didn't have fish in the tank yet. A few days after that, I added my fish.
So my question is, it's a cockroach. Will my water be effected or something?

Do I have to worry about anything? Will my fish be OK?
