What is the max recommend emerald shinners for 19 qt?

Your call. More bait will require more water exchange. ( fresh water) and air

Where can i buy a replacement aerator for my 19 quart?

Yours go out too? Apparently that's a common problem and the Frabill website always seems to be out of stock on the replacements. My advice would be to try to change out the motor in it from another aerator. That's what I'm gong to have to attempt.

Product Dimensions	2.54 x 2.54 x 2.54 cm; 4.54 kg
Part number	FRBBA219
Material type	Aluminum nylon
Capacity	19 Quarts
Power source type	hand_powered
Department	unisex-adult
Manufacturer	Frabill
Item model number	FRBBA219
ASIN	B07M8YVPS3

Frabill Magnum Bait Station 19 Quart Live Bait Well, White and Yellow

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