I have the 19. It works okay, but i need to get a 30 for summer so i don't have to keep changing water every couple hours. I would not go smaller than 19 unless space is really at a premium in your boat. 13 is perfect for bank fishing, 19 is a little big/heavy.
I use a rechargeable pump from amazon, it has worked well now for a couple years. I cant even hear it running and it will run all day and night on a charge, can also run while plugged into boat with 12v adapter. It charges with a usb cable.
https://a.co/d/077Kofu
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