I have 24 gallon BioCube that was running very healthy for several years. I added a new triggerfish and nudibranch the other day. I have about six fish and a few shrimps and snails. The next morning the new deed was dead along with the triggerfish I added. I saw the nudie squirting a white liquid out somewhere to when snails are mating. The next day I lost everything in my tank including some corals and fish Plus invertebrates. Can this poison from the nudie kill my whole tank? I have never experienced anything this devastating? I'm extra cautious with everything I do even when acclimating new fish. I even did a 5-gallon water change before adding the new fish. Everything in the tank was great except nitrates were slightly high but I thought the water change the local store said would correct that. Sometimes when adding the new water is stirs up a lot of the send which could raise nitrates a little bit until the water settles and I add water conditioner to the new water as well. I need advice or comments will be appreciated!
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You have several problems here that should be corrected. Please don't think I'm trying to bash you. I don't intend this, but there are some issues that should be corrected before moving on.
Most nudibranchs are a poor choice for a SW system since they usually have very special diets, and as you have seen can by very toxic. These are best left out of your tank. Note there are a few species that are ok in a reef system, but when in doubt, leave it out.
A trigger fish is also a poor choice for a reef system, especially a clown trigger. The minimum tank requirement for one is about 100 gal. Also triggers will eat most of your clean up crew, especially snails and hermits. Lastly clown triggers are very aggressive once they mature, and it's common for one to get so nasty that it kills everything else in the tank. If you really must have a trigger, consider a much larger tank, and one of the more docile species. It will still eat your clean up crew, but at least you can keep other fish with it.
Your tank, before the crash was way over crowded. 6 fish plus the shrimp just doesn't work out. By the time you set up a 24 gal tank with live rock and a shallow sandbed, you'll have only about 20 gal of water in the tank. In a SW system you want only about 1 inch of fish per 5 gal of water. So for that tank you want about two fish that are about 2 inches long. Yes, some people do go way beyond this limit, but they are really walking a fine line. The slightest mistake results in the total collapse of the system.
The big question is where do you go from here.
Since you lost everything, I recommend you tear the tank down and set it up again, using all new water. Normally you don't want to use all new water, but your water has been contaminated by the toxins released. Then cycle the tank as you normally would with a new tank.
As an alternative you could also do about 4 or 5 large partial water changes of about 75% of the water, each change done about a week apart.
You don't mention how you are getting your SW. Generally we recommend mixing your own using RO/DI water. This obviously means you need an RO/DI unit. Often the water sold as RO/DI by your LFS isn't RO/DI water at all.
You don't mention what water conditioner your used, but with RO/DI water, no additional water conditioner should be used. They are just not needed.