Hi,
Sorry i didnt get back. I thought i had a 'watch' on this topic, but maybe not!
If im honest, i've never found out the difference between t5 and t8. Its the usual lighting that comes with a Juwel Rio tank, if that helps!
The tubes must be at least an inch thick. not those thin little ones
As for meeting half way, i might be able to do that, if its just the tank. Not much space in my car!
Obviuosly if i get any interest for the whole deal, i would be more inclined to sell it as a package
after a bit of googling, i would say i have T8. they are more like 1" than 5/8"