Nice build
Our tank is a year old and we still haven't put coral in it...
Have you measured silicates in your water? If they really are dino's that you're seeing, they make their tests by absorbing dissolved silica from the water. Silica can come from your aquarium's glass for a short initial period, from your substrate if you went cheap and got silica sand instead of aragonite sand, or from your replacement water if you're not properly monitoring your sediment filter on the RO/DI unit.
Dave.M
Nice tank
I know someone who has a radion that is mounted at 18in above the water line and he has the intensity set to 90%. What intensity are you running? You should be fine if they are set around there. Also since the tank is 24in deep, you are asking the radion to penetrate 48 in to the sand bed..may be a little much..but PAR meter would be nice.
if you dont mind me asking where did you purchase the tank? nice setup!
awesome tank