Canister filters and biological filtration

I used to have the following setup on my 150 gallon tank:

Eheim 2028 (rated for 150 gallon tank)
Emperor Penguin with biowheels

I got rid of the Emperor and got another Eheim 2026(rated for a 90 gallon
tank). So with the two Eheims, am I getting as much bio filtration? I
understand the bio-wheel is really good, problem is, the tank is in my
living room, and the water splashing all the time drove me a bit crazy.
Eheims are silent, I still make sure enough surface water is moved, but it
is now silent. Since I put in the Eheim, on of my Angels died (3 days
later). Not sure if this was related or not.

Any suggestions?


--one more fact to add. Both Eheims have the recommended filter media
(bought the kit from big als)..