Thanks, tank is cranking right now. I just bought some pohl's and coral vitalizer, will see if that has an impact. In addition to food for coral and fish, all i add is strontium potassium mag iodine and fuel on a regular basis on top of dripping two part 8x a day. 150 gal consumes about 100 mls of each a day so i have to change 1 gal bottles about every month or so.