Re: high nitrates and dosing
If you keep inverts, the safe range I've heard from prominent vendors here is 10-20 ppm for snails, neos, Amanos, and fan shrimp. More sensitive species require even lower levels.
Tom (plantbrain) reports keeping neos in 45 ppm but with high O2. I couldn't keep Amanos in 40+ ppm under normal circumstances, but I've since gone to the recommended range and maxed the O2. I'm keeping all those successfully now but couldn't tell you if it's the range, the O2, or both.