Backyard Aquaponics
A place to discuss aquaponics

Not needed.

rock dust, can't we just dump in some crushed blue metal or cracker dust as commonly referred to into the system?

Not needed in AP but great for dirt beds

I remember another "figure" in aquaponics advocating a cup of rock dust into each growbed once a month.. Then complaining that the growbeds were getting clogged up.

We don't tend to add anything except quality feed..