Ya know... I started out my main with tap. Figured "how bad could it be"? The LFS
said we could either use theirs or ours. Whichever was more convenient. I didn't know enough at the time to know I couldn't trust 'em. I just figured they knew what they were talking about... RIGHT?! wrong.
I did go out and buy an RO
unit. Did I have to? Dunno. What I do know is that there is cyano
up against my glass in the sand. I can only guess that's where my tap water is still lurking. When it gets up to my main it dissapates and doesn't linger but I've been using RO
exclusively since just after Christmas (when I had my massive feeding accident). Seeing that cyano
in my sand makes me think I'm probably lucky that I switched over from tap when I did. My tap starts out at a TDS
of 150 and goes into my salt mix at 0. I feel really good about that. Absolutely necessary? Probably not. Am I glad I went RO
? You bet. I don't need to battle hair algae nor cyano
. There are more than enough challenges in this hobby (like having enough money, lol). I don't need to add to them!
Good luck with whatever you decide!