Hi Mick,
Wet/Dry filters are fine, especially in non-CO2 tanks. There is absolutely no point in modifying an already excellent filter in order to make it less excellent. The issue of Wet/Dry has to do with the possible escape of CO2. However, this is the same issue faced by tanks with sumps, or by open top tanks. In those situations you'd have to add a higher CO2 injection rate or seal whatever vented openings there are to overcome the loss of gas. In a non-injected tank the Wet/Dry is a bonus because there is no worry about losing precious CO2 and the dry area helps the nitrifying bacteria by enhancing oxygen availability. I'd just get on with it and forget about modifying the filter, which would do more harm than good.
Cheers,
