I use JBL Aqua Basis with sand on top to hold it down. It supplies micronutrients as does daltons. If you provide too much nutrient before your plants are established (and this can take some time) and using the nutrient you will have a lot of problems with algae. Once the plants are growing well you can add fertilizers in a number of ways. A lot of people overseas use very strong light, CO2 and heaps of fertilizers, and that is great when the balance has been found but it can be a rough ride getting there.