Fan exhaust is now venting through the floor. Rh in the 50-60s. Having trouble dialling in the feeding regime, but I think I will stick with 1.5L twice a day. Still producing around 0.5P run off per feeding. 2ml bloom gives EC of around 1-1.1 - could comfortably increase to 2.5-2.6. Light at around 35-40 cm