FH my fish have always fed (and they are feeding now too) on what they found around in nature.
Pellet food would only be an integration to speed up my BG's growth and population.
If the battery lasts for 3 months I won't spend 120 USD for rechargeable Moultrie one and solar panel. I'll change it with normal 6V torch battery non-rechargeable I can find here for less than 4 bucks.
