Blue Dream Haze - First RDWC Grow

This is my first hydroponics grow and will be using a single 20L RDWC system. Setup is in a 1mx1mx1.8m Mars Hydro Tent. Canna Aqua Vega measured as a combined total in all nutrient listings (e.g Week one is 2ml, so 1ml part A 1ml part B) Using every thing at half the recommended dose, unless mentioned. Full dose of Rhizotonic in this week. Had issues with temp control to get it at a stable 23c ended up having to plum a direct A/C feed into bottom. Was fluctuating between 18c-26c for the first 4 day. Also had humidity control issues, was at 35% but at 50-60% from day 4 on wards (two open water buckets seem to keep it at this range). Ph issue, won't stay at 5.9. Always rises back to 7.2 and above. Keep adding Ph down to correct, normal every 2-3hrs if I get a chance. Always rises back to 7.2 within a few hours. Solution at 400PPM. Slight rotten smell from solution, not sure if its from RHIZOTONIC, dogs went crazy over the smell of this stuff :) or maybe contamination issue (thinking this might be cause the Ph issue) Plant looks healthy so going to keep the solution until the weeks end. Day count started when transplanted into RDWC. Germinated seed in rockwool. Soaked rockwool in water Ph 5.5 for 1min, let drain for 15mins. Put into a mini green house, took 3 days to sprout. Transplanted after 2 days with no visible roots.