4-6 -21 Hydroponics system

My system used to sit across 2 55 gallon barrels.
I lowered it onto 2 cinder blocks on each end.
The pea gravel growbeds started to take it's toll on one of the barrels, plus I have some upgrades planned, so I figured if anyone wanted to see how this is setup, I filmed it being put back together.

Some of the toads are still in the pond from last night, still singing, all day today too, so that's what the background noise is. They return every spring to their favorite place in the neighborhood.
It's a bell siphon system filtering one of my water garden ponds.

The nutrients in the pond are not enough to feed the system so I still need to add a little scoop of granular fertilizer every couple weeks and keep a couple rusted pieces of metal stuck in the gravel to help with iron deficiency.. Idk if it's necessary with using the fertilizer, but it was one of the first things I did years ago when I first realized the pond nutrients just weren't enough by itself.