Questions about lighting and water changes

[hrdneglcry]

I have been an avid water changer for a long time. An experienced reefer recently told me that since I wasn't using RO water I might be hurting my aquarium when I do water changes. I am basically fish only but I have soft corals and some Anemones. If my ammonia is under control and there are not signs if stress is it ok to go longer that 2 weeks without water changes?

Secondly I use T5 lighting. I use 3 blues and a white but am looking into going 4 blue. I was told that blue provides more light anyway but someone awhile back said the combo of white and blue is what helps grow coral. Again I have mostly GSP and Kenya. Some nems and Palys. Is all blue ok or should I keep a white? The white seems to grow more nuisance algae.

 

[Glenner’sreef]

Are you using tap water for water changes? I’m sure tap will keep ammonias at bay but your source water is full of stuff not in your tanks best interest. You’re going to get a lot of responses on this post. Good luck.

 

[AydenLincoln]

I just think tap water is a recipe for disaster no matter how many additives you add to it to “neutralize” it. I’m team RODI water all the way.

 

[hrdneglcry]

Yes. Years ago I ran two 180's, two 120's, a 90, a 75 , and a 60. They were FOWLR. I never had any trouble with just tap. Instant Ocean and I did weekly water changes. But guy told me that doing water changes with tap might worsen the stability. My tanks are established. Probably RO is better but its not something I ever did. Maybe I will get a unit when I can. Anyway thread ask was asking if thjnga are stable are water changes needed every two weeks? Seems like no to me.