bio balls are great can be expensive for a lot try pot scrubbers or lava rock for cheapo ways.... coffee filters get expensive try paint strainer bags froma paint store.... floss is great go to a fabric store and by big sheets of 100% polyester batting and cut to size ... carbon can be expensive too so once you get the biomedia seeded good you wont need that at all
Here I think, that above view is great for a change, but aros are best from their sides. My tank I can see them from the sides, but it is low enough that when I feed I can still look down upon them. Even if the pond is at ground level you can put a glass pane in on the side.
yeah i know, im just letting you in on some info that a pond is possible for aros, even breeding them at home. it dont matter if you have it in or outside your house as long as you got the space and besides, wyldfa is right, aros arent that nice from the top unless you get x-back golden asians( aros that actually have golden color at the back portion) which you cant coz its illegal in the states. if you plan to keep silvers, stick to a large, very large tank. you'll appreciate arowana beauty better that way . but then again...........