If you have decided that you are in the market for custom aquariums, be sure to do your research beforehand to avoid making expensive errors. Remember that first and foremost a fish tank should be created for the benefit of these gorgeous living creatures and not as a decoration. Yes it can be educational, look marvelous and make your living room the talking point of the vicinity but it should also be clean, welcoming and remind its inhabitants of all the great features of their original habitat.
When you are deciding on the scale and shape to purchase, keep in mind that you must keep some of your budget to buy the essential gear you'll need. You need to invest in heating and lighting equipment. You will also have to put money into some filters and perhaps an air pump. Based on the kind of tank you may have you may need some water chemistry adjusters but you will definitely need some testers to keep the quality of the living conditions ideal. You may also want to invest in some decor for your custom aquariums. This has much less to do with making the tank look pretty and more to do with replicating the living conditions the fish would be used to in the wild. Some fish like to dig into the sand while others like to hide among the coral and rocks. Others would like to feed on algae which is poisonous to some fish. You need to talk to a breeder or expert in your aquarium center before you decide on exactly what you put inside your tank. Always buy materials suitable for use with fish and keep away from second hand objects as they could carry disease.
Never get rocks from the ocean shore even if you have salt water fish tanks. With custom aquariums you could never be too cautious in terms of protecting your investment.