I'll see what I can do here...
1. I'm assuming you're talking about foods for larval fish? The simple answer here is copepods. Rotifers aren't really a good source of nutrition on their own. They work fine for clowns though.
2. Honestly, I never test pH. pH is important but is usually kept in check with proper husbandry of the larval fish.
3.(a) Broodstock diet- variety of foods and multiple feedings every day go a long way to producing viable eggs and larvae.
3.(b) A reliable heater and thermometer will make things a lot more successful.![]()