Are Sea Cucumbers right for your tank?

How large do they get before they split? This one has put on a good size. I only get to see it some nights after lights out.

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mine when stretched out was about 7-8" easily before the split. Not that I had option, but I like them smaller. Having two 3-4" now. Like someone bought me another vacuum for my sandbed.

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WARNING - I'm sitting here watching most of my fish die in my 180gallon from the cucumbers in the post above. I've always heard they are ticking timebombs, but I didn't believe it. Considering I've had them for many year and even split which was fascinating, but poisoning your tank is not worth it.

Few hours ago, I saw my corals closed and fish are hiding. I knew something was wrong because these are 7-10 year old large fish which I know their personalities and their activity levels. I knew something was wrong. I saw a piece of flesh fly by which had the pink which immediately looks like my 2 cucumbers, but then the 2 cucs walking around just fine. ... so where did that piece come from? Did I have another split that made it to the sump and eventually went through the return pump? (That's the working theory).

I'm running aggressive carbon through a reactor. 3 confirmed deaths and what's sad is the larger older fish. I can't water change fast enough to make an impact in a large system so I can only hope to clean the water. I'll take the body count in the morning but I will be taking those cucs out. Don't do it. It will happen one day.
 
Do you have an charcoal?
yes. charcoal = carbon. My reactor is 1.5 cups for load. I ran it for 3 hours then immediately swapped it for a fresh can. Then let that 2nd can ran overnight was all I could do. Body count this morning = 15 dead including XL tangs and wrasses. Sad morning with any of those 7-9 years old. Surprisingly the hippo (6-7in) made it.

Lessons learned. ..pulling the cucumbers. I just don't know what to do with them right now.
 

WHAT’S THE HARDEST PART OF REEFING TO EXPLAIN TO A NON-REEFER?

  • Why a tiny coral frag can cost that much

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  • Why I spend time testing and adjusting water

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  • Why corals are living animals, not decorations

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  • How much time and attention a reef takes

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  • The difference between freshwater and saltwater creatures

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