Also I just found out that I'm doing a big mistake.
Actually I'm using 100% RO water. I didn't mix any tap water to it. Only fertilizer that I was using is Ferropol which may not be enough I believe. I already lost 6 neons.
Any help how to restore sanity would be highly appreciated.
1. Should I mix 50% tap water to the RO water for next water change?
2. What the fertilizers that I should add apart from JBL Ferropol?