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michael grady
03/24/2013, 04:17 PM
Hi Guys,

I've been been keeping a 110 gallon mixed reef for about 18 months. I'm about to upgrade to a 225 gal system.

I've recently noticed a little red algae growth in my tank, which i've never seen before.

I have a refugium and I run a BRS 6 stage RODI unit. This weekend, I noticed the expiated TTDS reading was in the 18 range rather than being in the 1-2 range I thought it was in. I guess I git behind in changing the media in the rodi system.

My question is, should I discard the old salt water when I do my new build or use the old salt water and just add something like phosban?

Thanks for the help!

Michael