Hi there, i am looking to buy a new Aqua One Aquastyle 620T tank. I like the look of fine sands, almost like in marine aquariums, or a 2mm gravel, as opposed to the traditional bigger gravel. Is this ok for tropical tanks? Does it get dirtier quicker? Any problems with cleaning it? I have seen in a few mags, people have used either play sand or silica sand?? Is that ok too?