Posted: Fri Oct 27, 2017 3:00 am Re: Canister Filter input
I agree with not going off of the advertised flow rates so strictly. The conditions used to achieve the flow rates are probably optimal conditions for the highest flow rates possible. Probably brand new filters, with zero media, zero restriction.
Biggest thing is getting a filter than can handle your tank. You want plenty of flow rate, plenty of space for media. Reliability. If the SunSun was doing fine, then you already know of an option that will work. My Penn Plax has noticeably better build quality over the Sun Sun. For noise, they are both very quiet. They both clean well. Positioning the output and input in a way where water flows well through the tank, leaving little to no "dead spots" (no flow) will keep your tank nice and clean. Bio media will keep the water parameters good.
I read reviews on things that I am shopping for too, and saw the reviews you speak of. The Penn Plax can be difficult to prime if you do not fully understand how to prime it. Or if something is wrong with it. The priming mechanism works, it's a push prime just like the SunSun. You want to fill the canister first by pumping the button a few times to get a siphon going. Water will flow into the canister and fill it. Then you turn it on. At that point, it should start to flow. Air bubbles will purge out for a little while. No difference between the SunSun and Penn Plax, at least for me. Do keep in mind that, what might be difficult to somebody else might not be difficult to you. Take reviews with a grain of salt. Unless you see a constant complaint on a product's reviews that are concerning (like the leaking issues with some SunSun's), then you can make your own decision on whether or not you want to deal with that. Makes me wonder if the people who had trouble priming it have it setup correctly as well. If it works off of siphon, you need to have the canister lower than the tank. If the hoses are run in such a way where the siphon won't be strong enough to overcome twists and awkward hose positions, then that may also affect the filter's performance. I am rambling now, but you get the idea.