the skimmer cap says aquarium systems manufactured by instant ocean, salinity is actually low as i just checked it , i have to go get salt today, and i dont honestly get in the tank much other than to scrape the green algae off the glass.. and about green algae it spots on the glass and spreads .. what is it and why and how do i prevent it... i have Tech 1 iodine, and nano reef part A and B, how often should i be putting it in, being that i have been putting it in maybe once a week