Digging up the past here.
I've got the internal juwel filter running at 600L per hour and the external TetraTec EX700 running 700L per hour. Since my tank is a 180L the specs for the TetraTec EX700 says it is well suited up to a size of 250L. Does this mean I can remove the internal and not suffer any adverse conditions. I really dont think the internal does that much anyway since I have removed the fine cotton filter, Green Nitrate filter, and Black Carbon filter. Its probably only working in a biological sense but the external should be well capable of taking over the strain. The fish I have are in my signature below...(I am aware the sharks will get alot bigger!!
they will be taken out in a few months, I'll enjoy them until then!)
Any suggestions would be great.