Fish, Quarentine and High TDS

[ricwilli]

I would like to know if high TDS has any effects on fish?
I have an rodi unit running two di cannisters. I use one di canister to make rodi water with tds of 0 for my reef. I use the second di canister to make rodi water with high TDS for my quarentine setup. Currently the second di canister is producing a TDS of 10. Once the first di starts producing a TDS of 2, I change it and use it to make rodi water for my quarentine setup. I do this so that I don't exhuast the first di canister to fast, making water for my reef and quarentine setup.
My quarentine method consists of the Transfer method. So I make quite a bit of water. I'm woundering how high can I let the TDS get up too without effecting the fish in quarentine?

Hope all this makes sence. Thanks

 

[SDguy]

IMO no. I've only ever used tap water on my QT's for fish without issue.

 

[Dr Colliebreath]

I don't know how big your qt is, but I wonder if you are saving enough money to justify the effort you are going through changing out di cartridges. You shouldn't see any issues at a few tens of TDS unless your water has something particularly bad in it. I wonder if the di resins could start releasing certain of the solids and create a problem.

 

[MrTuskfish]

IMO no. I've only ever used tap water on my QT's for fish without issue.

This will start a war; but (IMO & IME) tap water in many places is fine for fish-only systems. Many places it isn't. Anyone can get a report that shows what's in their tap water from their water company. Before moving, I kept many fish in tap water for 10 years or so. Did the same prior to another move. Many were considered very difficult fish. RODI is always the safe bet; but in many areas, I think a new hobbyist can keep a simple FOWLR tank with tap water. Its done a lot more often than we realize. While on the subject; nitrate at say under 60ppm isn't going to hurt a FOWLR tank either. IMO & IME, insisting that all new hobbyists need RODI and near zero nitrate in a FOWLR just isn't doing them any favors. If the hobby takes hold, most folks will get a RODI system when they need it.