Veg for 4 weeks.....GDP is a real slow grower.

The only maintenance I do is 2-3X a week I drain off 4 gal of nutes and replace with RO water. I add the nutes back in as I see fit with the PPM levels and all.

I do this to get rid of any salt build up and to re balance the nute mix....I guess some may consider it a res change I just consider it add backs though.

The B.B guard my root zone against hydro nasties and convert plant waste to usable nutes...my res gets some light in it and I haven't had a single algae problem, again BB and recirculating buckets with plenty of O2 provides this.