Hi, I've been reading these forums for awhile now and have noticed that you guys give really good advice to less experienced hobbyists such as myself, so I thought I would try to get a bit of advice here. First off, i've been just running a small community (30 gal) tank for about three months now and things have gone excellent. I just recently acquired a rather large acryllic tank from my uncle (I didn't remember it to be this big, apparently it was a different tank his friend had gave him). The tank is 180 gal wide or 6"x2"x2". He told me that it used to be the home of an expensive Arowana. He gave me the tank because he didn't want to deal with his house being flooded by the water cause of the frequent earthquakes in San Francisco. I guess my question is what I need to get for it. I have lights, a cover, and a base for it, but I need to know what kind of filtration to get. It has one cannister filter but he said it needed another one. He recommended a wet/dry system for it, so i'm a little bit interesting on knowing more about that. We also got about five buckets of coral sand (not sure if that is okay with freshwater setups) as well as some other smaller things, such as a powerhead. I also would like to know about cleaning it, whether to use chemicals or not. I know for my 30 gal, I used a liquid bleech/water mix over night and then let it air dry for a day. So any help would be greatly appreciated.