The buckets are just plain 5L 1$ buckets with 10 holes drilled in the side and in the bottom. Filled with 3parts perlite and 1 part vermikulit.
View Image
This is nothing like a hempy bucket. This is like sticking regular plant pots in an external rez. No resemblance to a Hempy bucket at all imo. Sorry.
Also I think your plants look over watered. Are they sat in water 24/7?
Do something very similar,
Big net pots (8") sit on bottom of my rez (2 gallon).
filled with hydroton
air lines fit into the bottom of net pot. (cant be removed)
AND NO AIRSTONES ! never again!
works wonders. plants love it!
less likely to tip over vs using small net pots.
I have strange growing conditions so the added heat is not a problem. At night it can drop to 15c and daytime its 25-28 c depending on the weather. The extra heat is just a +.with the airpumps its give and take. It does add o2 to the water and roots but it also adds heat.. which isn't good. Just keep an eye on it.
Ok here is my passiv hydro setup. I think its a hempy but some didnt so I run it in a new thread.
I have some hempy experience and I really like the result of it. At my new location i sometimes need to leave it for longer periods so i modified the hempy bucket to a extended reservoir hempy.