Originally Posted by AbbeysDad
But as you wrote in another thread, you have two canisters and each is rated for your tank size and setup like a whirlpool. I think far too many buy into the myth that we need 4x to 10x the tank size in filter flow gallons per hour (GPH). It has always seemed to me that if we can't filter/purify the water by filtering every drop 2x-4x times per hour, something must be wrong and blasting more water through really won't solve the problem.
I also have trouble with the obsession that there needs to be so much flow so there is never any mulm on the substrate. This is really counter productive as mulm feeds the substrate organisms that feed the plants and creates the very best bio-filter. And how much sense does it make to remove this organic material only to compensate by adding bottled fertilizer?
Finally, and perhaps most importantly, are the fish. Many/most of our fish were not raised in raging rivers, but rather tanks or ponds. Having to swim hard just to stay still must be difficult for many fish.
Proponents of over filter flow say 'but my water is crystal clear'. But then my water is crystal clear and my flow rate is only about 2x. Go figure.
Speak about flow rates and particulates, and crystal clear water, when you have kept large tank's holding numerous large Cichlid's,pleco's,goldfish, or large number's of fry,bait fish.
Even those who run heavily planted tank's,particularly those with CO2 injection,,strongly support heavy flow rates(10X) to assure CO2 and nutrient's are dispersed throughout the tank.
Not as critical in natural planted,low tech tank's where nurient's ,CO2 aren't being dosed as heavily as they are in CO2 injected tank's .
You keep saying it is a myth regarding water movement,flow, but it is only your opinion.
Hundred's,perhap's thousand's of accomplished hobbyist's (myself included) have learned otherwise, as will you when and if you attempt to care for a large number of larger fish.
Because YOU say it is a myth does not make it true in application.
Been there,done that.(Many other's).
Would urge those interested to google the question... "How important is increased flow,filtration,in the aquarium?" and form your own opinion's