I use [this](www.amazon.com/dp/B003SUT6VS/ref=cm_sw_r_cp_api_i_A7wPCbMSE7RCT). My tall guy, Tevye, loves it! Before I started using it leaf growing was a slow business, only one at a time and about 8-10 inches long, 12 inches if I was lucky. After, he more than doubled in height, and his leaves come one right after the other, some over 18inches long! I pinched and notched to get some branches a while back, and after my first spring fertilizing last month, he put out FIVE new giant leaves. TLDR; buy that one, Tevye loves it.

The cheapest hydroponic fertilizer in small quantities is Dyna-Gro.

https://www.amazon.com/Dyna-Gro-DYFOL008-Foliage-Pro-White/dp/B003SUT6VS

I’m on my phone, so I don’t think the link went through so here it is: https://www.amazon.com/dp/B003SUT6VS/ref=cm_sw_r_cp_api_i_A7wPCbMSE7RCT