Yes. Hatchets Ideally should be provided with a somewhat large tank as they are quite active fish. They have been extremely well known to injure themselves in ornaments, along with jumping out if the tank. One of the most likely resons to as why your hatchets aren't ehxibitng this behavior could likely be due to the School size. They should be in schools in no less than six, ideally 10 as by keeping smaller could put them in danger leaving them very succeptable to diseases, getting picked on, being nippy, and feeling insecure. I would highly recommend that you rehome this species along with the pleco unless it is a pitbull, bushy nose, bristlenose or bull dog plecos. Then you can ideally keep then in a 20 gallon tank, provided lots of filterstion and a mature, cycled tank with stable water parameters
Also, what types of hatchets do you have. As most of the more common species such as marble, pygmy and silvers are all a bad choice for your tank IMO
Last edited by Mo; 03-29-2012 at 02:30 PM.