No fish? Then I would worry that the water has 1ppm of ammonia and .5 NO3 from the tap, unless that substrate is leeching it into water. Everything else looks good, maybe add some baking soda to get 1dKH to keep from getting wild ph swings. If it is coming from the substrate, I would stuff it full of fast growing stems, stock some fish and call it good. The swap and shop here often has a lot of plants for sale for cheap. The online plant dealers that are on the bottom of this site also have some very nice packages and hard to find plants.