Ok I have got a 20g tank with a Bio-wheel filter. Can I upgrade to a Filstar Canister Filter XP1, with a turn over rate of 12.5 times per hour? This is becasue on Boxing Day it will be dead cheep. I aslo have a 10g which needs a filter so I may put the Bio-wheel on that.
My 20g may soon also become a low light planted tank. The problem is that the light in the hood is only 18w. By the WPG
rule I have .9WPG. Is this good enough or should I upgrade to 30w?