IMO there is a good source of soil from local florist (Far East carried them) that is perfectly for aquatic use. It is called Aquatic Compost imported from U.S. and is meant for pond planting use. (You still need to add a layer of lapis sand on top though).
Unfortunately lately they run out of the small package ($6+) and only the larger one ($15) available. And it is really large package so if yours is small tank you might as well get commercial base fert or ADA soil in a smaller package which will save your trouble.
Others may recommend you the potted plant compost that may work equally well. One popular one that often mentioned is the cocopeat soil from Cold Storage. Do a search to find out more.
BTW how big if your tank ? 5 ft x 1.8 ft ? Then you may able to consume the large package of Aquatic Compost.
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