“The Tank” (**1/2 out of four) was a better-than-average horror thriller about a seemingly happy married couple (Matt Whelan and Lucianne Buchanan) who inherit a beautiful coastal property; initially, they’re exhilirated until they soon realize that they have unearthed- and unleashed- a demonic creature who has been buried for centuries and now is ravenous and blood-thirsty. Ultimately too derivative of too many other horror pics (“The Descent” in particular) and too protracted at nearly two hours but is suspenseful and well-made and does feature some scares and chills. A mixed bag overall but good of its kind and worth it for horror junkies.