I've now failed twice to grow HC, both times looks OK for 1-2 weeeks and then just starts to rot. 100L cube 20" x 20" x 20", ADA amazonia, recommneded co2 lime green drop checker with kh4 water, 10x flow, co2 below koralia and blown down across HC, 9 hours 28W 3 hours 56 W, ADA step 1 daily. I...