I just adding it to feed the cycle... a pinch... my deli shrimp have been gone for a week now... I am sure I am feed the algae too...
Kind of mixing advise on cycling from lee, randy & prow... in how I am cycling the tank...
Here a post from Randy Holmes Farley - replying to questions about cycling a tank... I think his 1st sentence is true for sure...
"
There are as many strategies for cycling as there are reefers.
I never kept mine with the lights off, but some prefer to keep algae down during this period. It is usually not necessary or desirable to add ammonia if you have live rock.
I personally do not think that nitrite is worth measuring, unless you just like to monitor things. Unlike fresh water, nitrite is not very toxic in seawater:
Nitrite and the Reef Aquarium
Nitrite and the Reef Aquarium by Randy Holmes-Farley - Reefkeeping.com
I'd monitor ammonia that will likely come from the new live rock (if that is what you start with), and maintain alkalinity and pH during the cycle. "