Residue on Glass After Manual Dosing

[crownsbroyal]

Hi, I have been manual dosing my BRS 2-part on my reefer 350 tank since I recently did an aquarium upgrade. I seem to get significant precipitation when adding the alkalinity. After a bit I get this weird almost crusty streaking in the inside of the glass. See the pictures attached. I have to actually scrap it off with my tunze magnet with the razor side. What is this? And is it due to me adding the alk or calcium at the same time rather than dripping it? I seem to get significant precipitation even if I slowly add it in. Thanks for your help!

 

[SeaDweller]

what are your levels and whats your Mg at?

 

[reef lover]

Try dosing 15 minutes apart and see if it helps.