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Corals can survive and be ok at lower ranges but just like you observed they are not ideel. I struggled just like you to keep my params in check when I was dosing by hand because if I missed a day or more it would swing (especially in my 20g when I was dosing). I went out and got dosing pumps...
Don't want to rain on your parade but if you put that fish in a 50g tank you will never ever see it. They are incredibly reclusive, I had one in a 12g tank that I saw once a month if I was lucky. I know one person on here had luck with them coming out (in a 12g) because they had several...
If you can hold out for a little while, AO is having their anniversary sale and their salt prices look very nice. I would give the Aquavitro a shot. ESV some people love but it is quite a few steps and measurements to get it right. I would rather be a bit lazier and know I am still getting...
That light looks amazing, I love the fact they have green and red leds in there as well. The fact that they are wireless and sync to your vortechs is another added bonus. I am invested in my AIs right now (and the prices came down which is awesome), maybe down the line.
You might want to hold out for a little while. Looks like there is crazy new stuff coming out of MACNA as far as LEDs go and prices are coming down:
http://reefbuilders.com/2011/09/09/ai-sol-phoenix-led-light-aquaillumination/#more-47657