There's nothing wrong with that. the minimum space depends on the size of the plants. I usually grow just the one plant in either my 70 litre res, or my 145 litre res. But I have grown 6 plants in them too. Smaller ones obviously. The reservoirs are about 2'x3', with the tents being either...
Re: Multiple questions on DWC water - PH & PPM - Both going up without any real plant
I start my seeds in paper towels and once the seedlet has reached 1-2" I put it straight in to the clay balls. I have never had any problems doing it this way.
I use empty water (my tap water is 0.10 EC) for...