No, don't change the filter media to MA, stick with Eheim filter media, they are A LOT better then MA.
For the 2260, you don't fill them up with bio-ring completely, you still need to have a similar media mixture like what you were using in 2215. I recommend you use 3 L Eheim Mech, 加兩塊生物棉 (最好一密一梳,密的放較底), and then 10L Eheim Substrate Pro, 最後加塊薄的生物棉分隔才鋪白棉。Regarding choice of 白棉, take a look here:
viewtopic.php?f=18&t=111605If the lighting come with GLO T5HO, stickwith it, you don't need to change it immediately.
真開心見到你d post. 十萬个唔該晒