I do not know about aquariums, but I just today swapped out tubes in a 4' fixture in my garage. The ones I got:
http://www.amazon.com/gp/product/B00IBVNDNG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
To put these in you REMOVE the balast entirely and just wire hot to one end (to the tombstones on the end) and neutral to the other. So basically cut the wires going to the balast and wire direct to the feed. Took all of 10 minutes and most of that was getting the ballast out.
The one quoted appears to not expect you to remove the ballast, but just in terms of reliability I really like the idea of getting rid of all that old stuff - less to fail in some strange way later, or melt, or consume extra electricity.
Note again I have no idea if there are aquarium sized versions of this, or ones suitable for plants, but you might shop around a bit if you feel up to removing the ballast (and anyone who can clean an aquarium filter and cycle a tank can certainly remove a ballast).