I like polyaddict86 thinking about more bichirs. LoL he has an ambitious mind.
DMD123 I am surprised you are still running canister on a 300. One thing I do wish is the fx6 come with wheels to roll it. LoL
If I had a 300, I would have run a sump filter system.
When I got the big tank, I already was running a 210g with two FX5's. I found a good 'sale' on an FX6 so I just added the third. (The sale was a typo at petsmart when the 6 first came out. The website showed the 5 with a reduced clearance price but I was pretty sure the market was all out of old stock. Sure enough when I ordered it, I got the new 6)
As time went on and a Black Friday came along I replaced one of the 5's with a 6 so that I could have a backup filter. Then this Black Friday came with another good opportunity to replace a filter came. So in the big picture my filters really did not cost that much and Im happy with them.
Im not against sumps but at the time when the tank got set up money was a bit tight since we were in the middle of a move and huge home remodel so having two 5's already saved some money. Who knows, I might eventually change things out at some point.