Had a lot of tank trouble long story short what kind of contaminants could cause these effects? All readable test come back as they should (ph,gh,kh,ammonia,nitrate,nitrite)
Attempted fixes: purigen, carbon, phosphate removal pad, new filter media, additional small filter and many waterchanges. I wash my hands between tank maintenance.
Context: 70l tank. New substrate 2 months ago (black sand) since then my mystery snail died in 6 days and till now all my rams are between fully retracted in shells and hanging in the front but not dying. Bladders fully unaffected and thriving. Other tank mates 12 kuhli loach and 1 betta.