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If I don't use any medications or none of the fish in my QT are sick can I just use the same wheel in the marine land filter and just replace the cartridge?
I assume you are talking about replacing a brand new bio-wheel with a "cycled" one (i.e. one that has been down in your sump for at least a month). That is fine so long as the cycled one fits i.e. is the same size.
I use a 100W on my 10 gal QTs and it works fine; but that same heater can struggle to maintain temp if used on a 20 gal when the AC is blowing. So, you might wanna get a 150W for good measure. That works better on my 20 gal QT.Oh, and how strong of a heater would you need for a 15 gallon QT?


