New Brackish Tank

[Slsegul]

I just got a 75 gallon aquarium. I have 3 spotted puffers, 1 striped peacock eel, 5 white Molly's, 4 glass cats, 2 pictus cats, and 2 danios. What other fish would go well in my tank and I plan on taking out the danios and I want cat fish that will take brackish water that actually clean the bottom