View Full Version : What is the film on the surface?

12/14/2010, 01:50 AM
I dose Randy 2 part (alk, Cal, and Mag) and notice there is a film on the surface. is it bad ? I don't know come from which part though.
I am trying to take them out. Just want to know what it is .

12/14/2010, 05:48 AM
Are you are dosing Randy's recipe #1, which calls for baked baking soda (sodium carbonate)? Is so, dosing too much of the sodium carbonate at one time or into an area with little flow, can cause precipitation of calcium carbonate which can appear as a white film on the surface. Calcium carbonate is like a very fine reef sand.

12/17/2010, 02:27 AM
Thanks. I dose them in the middle of my tank with medium flow. Maybe I dose little much . thanks for your answer, Cliff.

12/17/2010, 06:06 AM
Your welcome. ;)