Best way to grown and bring on seedlings / cuttings ready for a wilma re-circulating hydroponic system?

Glass of water , root stimulator ( no clone gel or something else) put your cuttings in the glass together with a Airstone will have good and fast results. No growcube needed. Happy Cloning 👍

get a vase or some kind of can and fill it with water, put in the shade of your other plants, no direct grow-light. , its cool if the container dont let light in as that might be damaging to roots. But i have done it in see-tru can. np. Wait 1-2 week, refill water if it evaporate.. your cuttings now have 3-7cm roots. untangle carefully. Place them in hydro pots with claypebbles or rockwool or soil.. anything that can get the plant a stable base.

I do mine in a bubble cloner. Fastest way to get roots popping., from there, directly into your clay pebbles