aquastyle

Hi All, I'm thinking of getting the aquastyle 620 tank dimensions are 62cm W x 52cm H x 39cm D. It says the capacity is 90L but when I put it in to Aq advisor it says it's 120L and I'm mega confused. Would this stocking work? My tap water GH is 1-2 and PH is 7.56 - 8.01 2 Dwarf Gourami 6...

Hi, I recently picked up a sweet little 2nd hand aquastyle 380 tank. It has a top filter but the powerhead is missing and i don't want to use an internal filter. A replacement genuine aquaone powerhead will set me back at least AU$35 so I was wondering whether there are any aftermarket products...