[turtlehead]

are they good? customizable like the aqua clear hang on back.

 

[Raul-7]

Are you talking about the canister filter? Here's a great review by James aka Aquaverde: http://www.plantedtank.net/forums/showthread.php?t=12028&highlight=Jebo

 

[turtlehead]

the ones that hang on the back.