On my little tug (45') the water tank is under the tug deck.
Three questions for you...
It is made of plastic (heavy duty thing) is very large, is about ten years old and has a bulge in it. Will it burst? Its been like this the five years we have had the boat. BUT if it burst it would flood my boat as there is no bulkhead. Should I be worried?
If I removed it and used the front locker (deep hole) for the water tank would this alter the ballast of my boat. I know its difficult without you seeing her but she has ballast in the back cabin, the heavy engine sits on the diesel tanks just behind the centre point. There is a small amount of ballast under the tug deck the rest provided by the water tank. Then I could use under the tug deck for lots of things!
Are integral tanks OK I presume they don't rust inside out if treated and maintained well?
Thanks
Jac