Why are people so reliant on what their test kits are saying. If I was you I would be happy with the coral colours you have got. It's a really nice looking aquarium. So what if your nitrate test kit is saying 50 , what is the problem in your tank ? Nitrates are no were as important as phosphates when it comes to coral colouring. You also have to remember that I was using zeovit 3 years before the americans had even heard of the product. Now you are taking the advice from people who's tanks you have not seen in real life. You should rely on your eyeball a bit more. If your corals are looking sad do something about it. Not look at a test kit when your corals are looking good, panic and do something drastic.
The confusion with start2 was caused by the manufacturer changing the product. That caused me to say dose .2 ml a day not 2 ml as I would with the newer start2. Ask "cookie extreme" about that.
I can't go around the country holding peoples hand when it comes to dosing zeovit.
You have my phone number and email address, if you think you are doing it wrong contact me.
Brendan