I'm going to purchase a 300g stock tank Rubbermaid in my back room 69x63x25 high opinions needed on this I figure it's the right thing to do but I wouldn't Mind some input if anyone has done this
here is graeme's rubbermaid.
http://www.arowanaclub.ca/forums/showthread.php?p=37375#post37375
do a search on arofanatics.com for FGT (fibre glass tanks). very popular in asia. there is a ton of material out there for you to read and get ideas from.