I used 135 TDS carbon filtered water in my SPS tank for 2 months and everything was just dandy, especially the algea.
Tapwater don't mean it's going to kill things, it just have some ingredients that algea loves, your corals will like it also tho.
Tapwater don't mean it's going to kill things, it just have some ingredients that algea loves, your corals will like it also tho.