I definitely think that's what happened. You need to drop the FW tank and straighten it out. (You probably should drop it anyway because it is likely you'll have a few issues there as well.)
Sliding the 1" plywood out which supports the tank after you remove the front channel (two bolts) is best accomplished with two persons but can be done (as well as reinstalled) with one. If your plywood is rotten, you should replace it.
Make sure all water connections are disconnected before the tank is dropped and tank is emptied (as much as possible, anyway). It will also give you a chance to really clean it out with chlorine bleach (let it sit in the sun for a day or so and it'll look really good).