Thank you. I really have no special techniques. I use Pro-Mix and Farfard potting soil, I avoid MirGro because of fungus gnats. I fertilize with Peters and MirGro at 30% of what they say- if they call for 1 Tblespoon/gal I use 1 teaspoon. I use regular tap water that sits in 5 gal buckets for a day or so and only feed every 2-3 waterings. I use high N for veg and early 12/12, then 15-30-15 (again weak) occasionally during flower. I keep it as simple as possible, in fact my set-up is somewhat primitive. I don't do anything unless they ask, then I try respond to their needs with a measured response to avoid creating other problems.
These multi-strain grows are a challenge because what works great for some may not be adequate for others, but I spend a lot of time with my plants and keep a good eye on them. I like to pull them all out 2 or 3 times a week to take a look and water them well, at which time I can deal with any individual needs.
I think that good light, lots of moving fresh air, and keep them watered is the best advice.. If you use a soil with nutes in it you shouldn't need to feed much at all.
I've been doing this since 1985, indoor since 1999. I've tried Hempy Buckets and Bubble Hydro, but I find dirt is, in the end, the most time-efficient, cost-efficient, and most forgiving, while being the least mess, equipment, special shit, and hassle.
I meant to take pics today but it didn't happen- maybe tomorrow. I'm waiting on some harvests and have some veg. stuff raring to go into 12/12, incl. Space Queen, Critical+, Wild Rose, and some Caramelo x AO and Caramelo x Vortex. Also a Flav male and Jack the Ripper male. flav smells nice, JTR smells like burning rubber.
Next up to germ (about a week) will be :
Chocolope (DNA)
The Kali (Big Buddha)- never figured out why I bought this one
Qleaner
Chernobyl
Pandora's Box
Cheese Quake
and some homemade to be determined.