Ok, tack. Ska undersöka nogrannt och se om det finns minsta glipa. Har ju redan gjort om ljustätningen en gång men jag gjorde väl inte ett tillräckligt bra jobb… Fram med lim, tejp och svartvit plast…
Ang. väteperoxid säger förresten GrowFAQ så här:

How do I apply hydrogen peroxide?
Hydrogen peroxide is beneficial as an addition to nutrient feeding programs at all times. It feeds the good aerobic bacteria and kills the bad anaerobic bacteria. It also introduces radical oxygen atoms which oxidize elements, making them more available for the roots to assimilate. I apply 3% H2O2 at a rate of 30ml/gallon to the reservoir. The plants show no visible signs of stress afterwards, which indicates that it was not an excessive application.

Sprouting Seeds: add 30ml 3% H2O2 to 1 pint of water. Soak the seeds overnight.
Insecticide Spray: combine 250ml 3% H2O2 to 1 gallon spray mix.
Fast growing container plants: add 30ml of 3% H2O2 to 1 gallon water.
Hydroponics: apply 3% H2O2 at a rate of 30ml/gallon to the nutrient reservoir.