Those so-called AAA sphagnum moss sold in Flower Market is not that good in quality ~ I think you can try using peat / fine perlite mix that could be bought in 花寶 ~ Go take a look ~
I don't have experience useing this kind of perlite but I think it should be OK ~
Don't immerse the pot in water until the plants show sign of recovering. Use tray water to water when top soil is drying out ~ Give plenty of light for them ~