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Do you think the obsidian rock will ruin water ph or hurt my oscar fish because sometimes I feed them feeder fish that I breed in a seperate tank

Here's what the tank looks like

I have two Oscar's and two bristlnose plecos and was wondering what would be the best choice of large aquarium rocks the put in my tank. I have a 75 gallon tank wide I'm also going to put a diy bubble bar in the back of the tank Is it possible that I can put a natural obsidian rock structure...

Ok thanks

I have to large Oscar's and I left the room after putting them in the tank and when I came back one of the pictus catfish was on the bottom with a half severed tail what should I do.