That's awesome, I have a 33L too. Mine was used at a LFS and was drilled with 2 drains and 1 return. I have it all plumbed to a 20L sump. Sweet part is the tank with bulkheads was only $60!!! How do you pass up a deal like that?! Good job on the new set up. I've had mine running for about two years. I'm looking into a new tank though already. Going with a custom 90L (96x18x12) love that LONG shallow look.