Hi, hoping for some advice on optimum positioning of filter inlet, outlet and ( future ) CO2 diffuser. Tank is a 60 x 40 x 38cm 90 litre with an Oase Biotherm 250 filter. I intend to have the majority of the hard scape/planting at one side of the tank (triangular arrangement) with a relatively clear swimming space at the opposite side. I haven’t purchased any alternative filter inlet or outlet but like the look of the glass lily pipe style. I’ll probably introduce CO2 at some point in the future. So my question is where should I position the filter inlet and outlet in a set up as described and where would be best to position a CO2 diffuser in the future?