welcome!
i also have a fNd and love it.
there are a few options you have in regards to bait tank.
buy one; several options with varying prices
build one; many different builds out there using buckets, dogfood bins, water coolers, pvc pipes...all depends on how you are with making stuff.
you can make tons of accessories for your yak; carts, racks, rod holders, anchor trolley, light/flag posts...even outriggers, trolling motors have been added to fNd and other nice yaks.
check the innovations thread for ideas
http://www.bigwatersedge.com/bwevb/s...ead.php?t=6394
and then there's gugel