Originally Posted by
ophiura
It is not necessarily a question of a bigger tank. They can move...and many corals will secrete toxins in the water as well whether next to each other or not. It is just a risky combination of things. What kind of lighting do you have?
Personally, I STRONGLY suggest you find a new LFS, because the advice given (for example on the lion) is JUST PLAIN WRONG. They will eat anything that fits in their mouth, and will try to see what will fit.
Engineer gobies get quite large, and make lots of tunnels in the sand under the rock. This can be very risky in some respects.
The horseshoe crab will just not likely survive long term. They are often blown around by our pumps, which people think is "fun" but really it is extremely sad because it is an animal that is being blown around. If behaving normally, they are rather boring, because they are bulldozing below the sand (eating things you don't want them to eat).
Animals we keep should have the potential at least to get as large as in the wild. If not, we have to ask why not...and often it is due to our husbandry.
Again, I strongly encourage you to find a new LFS, or at the very least NOT buy another thing without a lot of research before hand. They are, plain and simple, giving you very wrong information (whether they know it is wrong...hard to know for sure).
But it would help to have your specific water parameters, including alkalinity, calcium and such. That is a huge bioload, and there may be some problems brewing that can be spotted.
I would say yes, you have been lucky..but it hasn't been tested for very long
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Ok, that horseshoe crab part almost made me cry. That is so sad. He is so incredibly adorable. He does bury himself most of the time, but he's still one of my favorites. I had absolutely no idea. I really wish I had come here first.
I will reply to the rest of your message. You have been an AMAZING help. Thank you thank you so much. I also realize that sadly I will eventually have to get rid of one of my other favorite fish.. the emperor because of the coral. I didn't realize that as adults, they will eat all of my coral. *sigh*