I am not an expert of fish tanks, but I think that you may have a problem using sand as it will probably clog up your filter. We have got a fish tank, and although Mr Jules does most of the work involved, I was the driving force behind design etc. We found some really nice gravel, be warned though it wasn't cheap this is covered in some sort of coloured plasticiser which helps the gravel to stay clean longer, but also it comes in the most fantastic colours, we opted for a midnight blue and with the right lighting it looks really good. I was always opposed to artificial plants, but we found that the fish were eating in the plants and so opted for artificial plants, but they are the fabric type rather than plastic. We picked up a few pieces of stone and rock in the aquaria and also steered clear of any ornaments, I think our tank looks pretty good, hope you get yours looking how you want it :)