Why do recommendations for filtration on planted aquaria differ?
Aeration and water turbulence from fast filtration and water circulation drives CO2 from solution and oxidises plant nutrients. Plant growers call this “over-filtration”. (In fact, this is a misnomer, since you can’t really overfilter a tank). To overcome the problems of nutrient oxidation and loss of CO2, plant growers opt for filters with slow turnovers, but a large enough media volume to support the fish. Don’t simply use a smaller filter because it has a lower turnover…
