I desperately need some advice on how to combat an outbreak of (what looks to be) bacterial brown spot in my cool vivarium (see photos). I have treated repeatedly with Physan 20, and it has halted the outbreak, but not completely solved the problem, 3 months ongoing now. I still see leaves here and there turning... I have lost about 10 plants or so (out of 300+), and many have been severely reduced in size because of leaves turning yellow and falling off, or me removing affected leaves to help stop the contamination. I really need some help how to take care of this once and for all! :bang: It started a few months ago when the fans in the viv had been turned off for a couple of days by mistake. Soon after this I notice the first symptoms... yellow leaves, brown sunken wet spots, and it was spreading pretty fast. I isolated those plants and cut off all the affected leaves with sterile tools. We do not have Physan 20 in Sweden, but I had a friend help me out and send me some. By the time it arrived I had seen symptoms on various plants all over the viv, since I water by misting system it was spreading all over, so no use quarantining plants. When the Physan arrived I took all the mounts and all the pots out of the viv (about 300 plants), removed all affected leaves, soaked them mounts/pots and all for 10 minutes in Physan (1 tbl/gallon, 1 gal = almost 4 liter) as recommended for treatment of Erwinia... figuring I wanted give it a good "cure" for starters. I also sprayed down the whole viv top to bottom (soaking the EpiWeb back wall) liberally with Physan. This seemed to halt the spreading markedly, but not completely. Killed off about 70% of all the moss though, but that's fine. Since then I have sprayed all plants and viv every 2 weeks with Physan (2 tsp/gallon as directed on the bottle). Physan is keeping things at bay somewhat, but is has not solved it! I still feel like it is a slooow loosing battle... what can I do?? Obviously I need to kill whatever pathogen this is, because otherwise everything is good, it is blooming like crazy! Are there better stuff (poisons, methods?) I can use - how do I fix this? HELP!!!! Vivarium measures 175 cm wide, 160 cm tall and 65 cm deep. EpiWeb walls with a Vivaria rain system. Temps 20-22 C day, 10-12 C night. RH 70-80 days, 80-90% nights. I have good air circulation in there and fresh air intake.