filter circulation ???

I have an Eheim 2213 canister filter on my 10 gal nano. It's been running for almost 3 years. Now it seems as though the flow rate has slowed down. I've never changed the media or have I done anything as far as maintenance. I'm thinking that I might want to open it up and possibly replace the...

I have a 40 gallon tank and when I set it up originally the lfs set me in the complete wrong direction. I now have 34 lbs of live rock 2 in live sand a small clean up crew and 2 clowns. The tank has been up for about 2 months. I have a nova extreme 4 bulb t-5 set up a seaclon 100 skimmer which...