It does matter if you care about 'food grade' products. That fish food is 'not meant for human consumption' and also not meant for use in agriculture for food products. These foods can contain dyes, heavy metals and or anything else you can think of. Theres no FDA on fish food.
I've kept fish for many many years and used to run an aquarium room with more than 25 tanks and I'd never even consider putting that water on my plants. Ornamentals? No prob but nothing I'm consuming.
It's like saying you bokashi your dog's shit and use it. Not food safe but ok for ornamentals
There are foods that are safe to use for aquaponics for food products but I'm sure they're more exp then some reg old fertilizer