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1. 5+ the reason for is they can be territorial as they age a large group will disperse aggression and it will make them a lot less reclusive and more active as school
2. 75 if you plan on keeping a group of 5
3. Like what was already said, Do not catch them in nets as they have spikes in...
now I don't mean to derail the thread or anything
but the spots seem a little big for a Corydoras melanistius its seems more like a Corydoras agassizii
the cat in the front appears to a juvie Rineloricaria falax (Delicate Whiptail) grows to about 15cm (6in.)
the fish in between the two P. hypophthalmus looks like a bagrid of some kind