Stem rot is where the tissue dies and goes squishy. Caused by overwet conds which promote pathogen growth.
The whitish goo you have is a big wad of pathogen growth, could be pythium or fusarium. About the best way I've found to suppress pythium is with hydrogen peroxide. I use 50% 'food grade' H2O2 at 1ml/litre of nutrient solution, every 2nd to 3rd day. You can use the 3% pharmacy grade H2O2 but you need to use 17ml/litre of standing nutrient solution.
If the bottom of a reservoir feels slimy, there's pathogen growth happening that H2O2 will stop. In severe cases, you get the 'goo' you're describng. |