Hi - I have been through a bad patch with water quality but am now coming out the end. Tank needed to recycle, as of today we're at:
Ammonia - 0.25
Nitrite - 0
Nitrate - 5.0
60L tank, no real plants or wood, Elite stingray 10 filter, 4 platys, 4 neon, 3 rummy nosed tetra, shrimp, hillside...