Stocking 46g tank need help????????

The 1 inch /gallon rule is only valid for slim, bullet shaped fish. For all other fish, you have to consider their entire size--width and mass, as well as length. Of course, behavior and territory must be an important consideration as well.

For a 46, you could easily add 4-5 cories. I would encourage you to stick with one kind, as they do like being in a group, and won't always mix. The pair of otos could stand being bumped up toa trio, and wait to add them until the tank has been established for 5-6 months. Make sure you get ones that have been in the store for at least 7 days--put a down payment on them if needed. Do some research on them--they are cool, and hardy once established, but getting good ones can be tough.

Hello, IMO an inch/gallon is good advice though this is only a guide and if exceeded care should be taken.

Robbie