If they are growing good, I'd leave it on the schedule that you're on. With the rapid rooter in there it may be a little excessive since that will hold the moisture a lot more than just plain hydroton but like I said, if its working, go with it. Also, I believe that whether you are indeterminate or determinate won't matter on your setup. You are going to want no more than four plants in that bucket. Probably just two though.

Difficult to diagnose with picture of only one leaf. Also need info such as pot or ground; how you water; how fertilize and more.

The pot is placed a few meters from direct sunlight ==>>> its indoors.. it gets NO direct light ... mostly because there is a window in the way ... and its simply too far from the diffuse light from that window ... the third pic seems to show very good new growth ... why do you say its brown?? ... how about a closer pic ... its going through some stress from moving it from one place to another ... all plants shed older leaves ... annually.. it can be increased due to stresses like moving it ... i think you are on the verge of loving it to death ... try to chill a bit.. and settle in.. and try to get it closer to a window... there is a houseplant forum ... where you can learn all about such ... ken

might be a watering issue.. and perhaps excessive fert .. a plant that size simply isnt going to use all that much ... is that where it grows.. it might not be getting enough light thru that frosted window ... and finally .... many babe plants prefer smaller pots ... and up potting as the roots hit the sides or bottom .... i dont think i ever got an answer why ... but it is rather common ... always focus on new growth ... and be sure.. if that is growing properly.. that you dont screw everything up.. being concerned about something that may have happened weeks or months ago ... ken