I would give them some hiding spots. My little sen used to like to hang out in fake plants resting, near the top...I would give them some wood or caves to hide in, and some fake plants or similar to hang out in.
As for substrate, yea bare-bottom is fine. Personally I lost a bichir to what was likely eating a piece of gravel, so I will never do gravel with bichirs again. If sand isn't an option BB is best IMO.
As for substrate, yea bare-bottom is fine. Personally I lost a bichir to what was likely eating a piece of gravel, so I will never do gravel with bichirs again. If sand isn't an option BB is best IMO.