If you want more specific advice then ask, I had a fluval M90 for 11 months. The 91 l (24 US gal) aquarium itself has been specifically designed with an integrated rear compartment (23 l or 6 US gal) that discreetly houses a Fluval Sea protein skimmer and submersible M-series heater in addition to an integrated drain valve designed to permit convenient water changes by connecting to a simple valve system inside the cabinet. Page 1 of 3 1 2 3 Next > A13273 - Fluval Roma LED 125 Aluminium Centre Cover Details A13274 - Fluval Roma LED 200 Aluminium Centre Cover Details A13275 - Fluval Roma LED 240 Aluminium Centre Cover ... A13945 - Fluval Edge 46L Rear Back Column Replacement Part, Black Details Search Fluval Products 1 - … This AIO has four chambers. The stock Fluval filtration is very dirty, an inTank filter system will fix flow issues with the stock design and sustain the aquarium longer. There is no over under scheme. Paul good luck with the new tank. Featured The only tank the mrs would allow- fluval m90 136l Discussion in ' Medium Tanks (31-100gal) ' started by kathryndis , Nov 3, 2013 . I have a Fluval M90 reef tank that I am modifying to be a planted tank. The problem with the Fluval M90 is that all of the baffles in the rear filtration section are designed so that flow flows over. Fits Fluval Evo 13.5 and Fluval Spec 16 in Chamber Two (accessory chamber). The first will house the InTank Media Basket, second is about 4"x10" and will house chaeto, third is about the same at 4"x10" and will house marinepure blocks, and the last chamber will house the skimmer, heater, and ATO (apex). inTank Media Baskets greatly improve filtration by keeping the rear chambers cleaner, forcing water through media and make changing a breeze without ... always been a fan of the Fluval M90 for the price. So, with my InTank media basket it slows down the flow through the filtration so much that a film develops on the top. The stock filtration is very limited and dirty which risks your live stock. Change filter floss weekly and run nopox from day 1 to control nitrate and phosphate rather than use a reactor due to lack of room in back chambers. Includes FREE plug to block off lower hole on false wall. It’s 136l and had a rear sump similar to a Fluval Flex, but on a much larger scale. Fits Fluval Flex 15 in Chamber One (intake chamber) Keeps rear chambers clean and promotes clear water; Forces water through filtration media and not just around it Not sure if this helps. The stock Fluval filtration is very dirty, an inTank filter system will fix flow issues with the stock design and sustain the aquarium longer. I would complete a water change each week and clean 2 of the 4 back chambers every week too. Forces water through filtration media and not just around it. Maximize and upgrade the filtration in your Fluval Evo 12 - 13.5 aquarium. 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