excellent info folks. i don't plan on using any chem. media... strictly mech/bio. I usually use poly floss and blue pads in all my filters, so I suspect that'll be the way I'll go in the xp1s as well. how about CO2 diffusion? does anyone bubbling into the intake have trouble with airlocking? My HOT mag did great for several weeks, but it slowly started airlocking more and more often (I think it was increased O2 levels in the water forming larger pockets as my plants started photosynthesizing more with the EI method I've recently adopted). so you can adjust flow with an included ball valve and it doesn't harm the motor of the filter? if what I've read is correct and I understand it completely, that's another advantage over eheims... everything I've read says that you can only "barely" impede the flow of an eheim with a ball valve, or it will damage the filter. I'm aware that eheim "classic" filters have much lower GPH ratings than XP series rated for a particular aquarium vol. example: an xp1 is suggested for up to 45 gallons @ 250 gph, while an eheim 2213 is suggested for up to 66 gallons @ 116 gph. I don't wish to delve too deeply into the discrepencies there, but wonder if throttling the flow is safe.
Eheim Pimp #171
55 gallon jungle in progress
; Eheim 2217, TurboTwist UVS, Seachem Onyx / Black T-grade ColorQuartz, 2x55w AHS CF, BeverageFactory.com CO2 Regulator with Clippard accessories
"If you ask me, you've got too much imagination. Everything's all loop-de-loops and flibbertigibbets." - Hank Hill