Backyard Aquaponics
A place to discuss aquaponics

Problems with flowering and fruiting are *usually* potassium (as hydro touched on above). Potassium chloride, potassium bicarbonate, bananas, seasol - all good sources of potassium

Well thank you very much for the vibrator tip but I will try the banana skins and see how that goes lol!

Moringa is also an excellent source of potassium

Anything to watch out for when adding these? wanting to be fish-safe.

1) KCl: I added a single handful to a 800gal system (3000liter?) and did fine. Was probably way more than I needed, but no problem. It is about 50% potassium. I place it in water running into growbed and let it dissolve.

2) bicarb KKCO3 (I would write K2, but can't write subscripts) is similarly harmless and slightly basic. It will tend to raise your PH. It is also about 50% potassium. I would add in same way as above. Don't use it if you are trying to drop your PH.

3) add bananas by burying in growbed and let worms or bacteria break them down. A banana has about 1/2 gram of potassium. Some folks talk about banana skins, but I would worry about spray residue. I've never used either.

4) seasol is generally safe and effective. Add it to water running into the growbed. I've never used it since we don't seem to have access to it here.