Bait tanks

[Marriott714]

I have 1992 Grady 175 spirit and need to fit a bait tank, any suggestions on where to install being the deck is tight for space.
Under the seat was an idea but the plumbing might be a pain. Does anyone make a tight space tank that will work?

 

[Hookup1]

On my 268 Islander with the Euro transom we ratchet strap a 15 gallon oval tank to the swim ladder. Bait pump connection is thru old 2-stroke oil fill holes to a 1,000 GPH Rule bait pump. Tank empties off back.