I don't use anymore RO filtered water using the filter that adds back minerals, someone recomment me a spring water here that with right parameters, he said breeding with this water like years and I did waterchange 2 days ago with this water with gh+, my tds is 180 now, better than before I think? 2 shrimps died after waterchange, but now shrimps looks good, there is no death today, I'm really happy not dead any shrimp, I'm going to buy gh test this week, shrimps looks good and moving but there is peace of molt on head 2 shrimps, here is pics, but they are moving, its a big promblem? I hope they don't die, Zerowater is expensive for me now, I think I will use this spring water for now untill use pure RO water.