Massive fish kill!

[Hangman]

I don't think this is your problem, but a 50% water change every 2 weeks is IMHO too much. YOu would be better off doing 25% every week or 2 weeks. Even that is alot of water to change out.

hmm I have been doing about 75% water changes every month. Tank has been running for years without issues. I make sure water temp and salinity is exactly same as tank water though..

[Andy]

When i had 6 large (12yr old) tangs & 20 yr old sofites in my 200 i did 75% water changes & it never affected anything, but the tank had been up for 7 yrs. No SPS.

Normal recomendations are smaller water changes more often.

I am doing 25% per 1-2 weeks now.

[Mrs. Mermaid]

Just out of curiousity what salt mix did you use when the fish all died????

[CRUSHER]

I used reef crystals, it's good stuff

Just out of curiousity what salt mix did you use when the fish all died????

[Mrs. Mermaid]

Reef Crystals was a good salt mix but they have a recall on it... I read it on another forum the person called instant ocean and they told him if your container has a date on it of June 2012 do not use. I do not know were the date is at on the containers. I have also looked online and can find nothing about a recall. On Reef Central several people have lost everything from that salt during the summer. So just be careful if you continue to use it.

[Mrs. Mermaid]

You might watt to call them and let them know what happened to your fish.