Most any catfish would be ok with your stock, just stay away from large catfish such as Redtails, shovel nose and other species that grow large enough to eat your angels. I would reccomend Synodontis cats as they dont grow too large and look great!
I know the rams need good water conditions. I am capable of keeping water good, had a 30 gallon a few years back, and tested every two days, had neons and a couple of cories. just wondering if the rams and angels would get along.
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