Something has happened in my tank that has wipeout every inhabitant bar my betta fish. Never had this happened before, not sure if it's due to anything new I have added in, plants, hardscape. Plan is though is to completely strip it and rescape. Will boil the two pieces of wood I want to reuse from there, as i will do the same with the rocks in there. Question is what's the best thing to use to clean the tank itself and also best way to disinfect the plants I would like to keep if possible?