I went to get the food bowl and it was covered in ants! I took it out, wiped the trail from the glass, there are still ants in the tank! any ideas on how to kill them with out taking all the e.e. out the 55 gall tank and not hurt the crabs? I was wondering why they weren't being very active as of late, now I think I know why! do you think spraying with salt water will kill them?