Dosing/adding Water To Tank

[smooth_9]

Hello all. I have a reef/fish setup, and I was wondering what is the best way of adding water due to evaporation. I have two 250 wat MHs so I run with no top. Also what should I be adding plain RODI water, kalk, ?. Will some of you let me know what type of system you are using.
Thanks SMooTH

 

[greatfullreefer]

You can use a top off pump system or a slow steady drip. Myself i use a drip with Kalk added. Also you must use R/O water with NO salt added, water evaporates but salt does not.

 

[smooth_9]

Thanks for the reply