Upgrading and spending serious money, please advize

  • We are currently upgrading MFK. thanks! -neo
9x4x2.5 is 675g. I would never consider anything less than a big sump with a pump doing at least 4-5000gph. The max size tank I'd put an FX5 on is a 135-150g tank.
 
Thats why I was considering two but your prob right a sump would be better cheers
 
You could try and build one in that this website has a lot of giant monster tanks that people built. I'm planning on building a 1000 to 2000 gallon cinder block fish tank in my garage in a year or two.
 
MonsterFishKeepers.com