I'm at a loss as to why corydoras catfish are so popular in the hobby.

they aren't attractive fish

they may clean the substrate of food but still add to bioload by pooping

they have to be in schools of at least 6 so take up a lot of "space" in terms of 1 inch per gallon guideline.

they are expensive fish (at least in new zealand) - the cheapest i've ever seen is $8 for a bronze cory.

Please everyone argue against me!