1 - used it since I started my tank. I used the red sea reef mature kit that requires you to use it when you cycle your tank. In total been using for 7 months.
2 - 88 litres
3 - depends on the readings from my nitrates test kit. There are different PO4 and NO3 levels to maintain for growth and coloration. On average I dose about 0.75 ml a day.
4 - daily
5 - good results. No algae
The only bad thing is you need to keep an eye on you NO3 - test about 2 times a week. If you don't it can have a significant impact on your corals. Nopox manages all algae including zooxanthellae