75 with pleco ideas

[YaelElMatador]

Hello, I have a 75 where I will rehome my Pleco(might be a common, I found him abandoned so I don't know). I was planning on having a school of silver dollars, a blood parrot cichlid and some sort of eel like fish such as a ropefish.

I was wondering if this will be alright or what has to change.

I am open to other stocking ideas with a preference to catfish and crustaceans but am open to all ideas

I have:
Fluval FX4 Canister filter
Sponge filter as an addition
Sand substrate