Multi Strain Grow Questions

Hey all so I have been thinking alot receantly about doing a large grow op using a hydro setup... I havent decided what kind of setup I want to use as I have several questions for everyone...

I am planning on getting a 8' x 4' x 7' grow tent for flowering and I want to grow probly 4 different strains...

My question is if I am growing 4 diff kinds of pot do I need to have a seperate rez/setup for each one? because they might need different ppm and ph levels?

If I do then what kind of setup would be best... I am looking to have a perpetual harvest going... were every 3 weeks I start a new set of clones flowering. And I was hoping to harvest 10 plants every time... so Im thinking there would need to be room for 40 plants going in there...

Any thoughts guys?

B to the ump....

... Does anyone have an opinion at least?

https://www.rollitup.org/do-yourself/156863-grow-2-lbs-2-x.html

just have one of these but smaller in size and bigger net pots for each strain. just run like 4 30gal res. with 8 plants in each in 4" net pots..????

i'm running one of these 32 site ones with 3" net pots right now. but it is just in the veg stage. but the growth is crazy fast once the roots get out of the hydroton