What's wrong with my setosa?

[daniella3d]

I don't think so, each time you do a water change you do alk swing.

It is much more stable to do less water changes and to dose every hour or every two hour.

There is no way doing water change without dosing will keep your level stable and unless you perfectly match your new water alkalinity (very difficult to do with a ULN) you will get swings. Unless your new salt has the same alkalinity as your tank, which is unlikely as most salt mix have high alkalinity.

I have large amount of corals and SPS in my tank and I do water change every month. I dose each day for alk and calcium and my levels are very stable day and night. I very rarely get RTN or STN. Think I had it twice in 3 years on newly introduced corals, never on older corals. I have a setosa that was in pretty bad shape when I got it from fragalot shipping and it is now all recovered after a week in my tank.

So until you do dose, you will never have a very stable tank and you will have lots of alk swings.

Originally Posted by Titus99

I do a 5 gal on tues and 10 on Fridays. Only because I don't dose or have a reactor yet

It works good to keep cal and alk up without big swings

I am buying a ca reactor soon here so that will stop when I get it