Saddle nosed corys can be aggressive to each other. You'll find that aggression levels in saddlenoses differ from species to species.

Septentrionalis are very placid, and I house mine with axelrodi without any trouble.

Hope this helps.

there defintely not sharp-there a bit rounded, but this is the best i can egt-apparently this type of gravel is used in planted aquariums because its small and plants roots can stay tightly the average size was actually 3-4mm diamtere Any good soil/gardening supply yard in Canberra would stock bagg...