A few years ago I bought two Blue Spots and put them in the same tank. I believe I ended up with a male and female because they'd stay rather close to one another, sometimes even on top of one another. Unfortunately, one found their way up a small hole around the return and pulled the Saran Wrap off. I kept the remaining Blue Spot for about two years. It was with me up until about 2 months ago, when his fate was the same as the other one. This time though, there was an acrylic lid it actually knocked over to the side - just enough to form a gap and allow for carpet surfing. So on this note, I must advise; these fish appear to be very cowardly, but that is only when there are other fish in the tank, or when you are around. If left alone or with other docile fish, they will occasionally swim freely around the tank, and at night, WILL explore all ends of the tank - even above the surface. I donââ"šÂ¬Ã¢"žÂ¢t know how many times I was woken up by the sound of splashing, only to go running over to the tank to see water all over the lid and the jawfish back in his hole. Keep a VERY tight lid, because eventually, the fish will hit every square corner of the aquarium that lies beneath it. And if you have an overflow, good luck!
As far as keeping the Blue Spot... They do not filter feed, if that is what you mean by finding food in the water. They also will not sift sand like gobies. They need meaty items and will usually snag it while its suspended in the water column. Mine loved frozen Prime Reef and Mysis shrimp but would also take flake. The feeding response is actually one of the more spectacular parts of keeping a Blue Spot. They'll wait in their hole making sure there are no threats around them, and when the moment is just right, they'll dash up, engulf the food, do a 180, and return back to the hole - it all happens in about a half second.
For a sand bed I'd definitely recommend crushed coral and even some small pieces of rubble. You donââ"šÂ¬Ã¢"žÂ¢t want the sand to be too fine as it will keep falling back into their holes. They'll also decorate the entrances with shells or small pieces of rubble. If there is enough LR they'll navigate through it and only use a small portion of the sand bed for their burrowing chambers. Every so often they'll totally rearrange the sand bed; youââ"šÂ¬Ã¢"žÂ¢ll end up with 10 inches in one corner and 1 inch in another. IME it never seemed to matter how much sand there was; they'd always hit the tank bottom. Personally, I never kept more than 3-4 inches. In this regard, if you're planning on keeping corals, you'd better keep them at least 6 inches from the sand or they'll likely get smothered.
The Blue Spot is a spectacular fish, but IMO they have such specific requirements that they basically require the tank to be designed around them. Hopefully this info helps. If you have any other questions Iââ"šÂ¬Ã¢"žÂ¢d be glad to share my thoughts.
~Aaron
