Has anyone here used rain water for their saltwater tank? I Have set up rain barrels and I am catching around 200 gal of water to use on the garden but I was thinking of using it on my saltwater tanks as well. The water is sadly acidic and would need to have a buffer added to get it to the proper PH level. I am using it in my salt water pond experiment without filtering. What type of filter should I run it though before trying to use it on my main salt tanks or my cuttlefish tank ? Note! Worry note I have been thought to much to take any chances with my cuttlefish!