| | Re: 600 Gallon some issues
You want to know what more to add? I think something with color. Ludwigia would look great . Rotala another of small foliage that takes to being pruned.
That aquarium is so big..you might try Spatterdock..not seen much because it is such a big plant. Internet has them. You might try Azure Hyacinth.. related to common water Hyacinth only it grows in the substrate and has striking blue stems. Again,on the internet.
The bigger Sword plants. Han Aquatics has some nice hard to find swords.
In those huge tanks? Mosses get lost. Better to grow more Java fern narrow leaf and it starts to give you the moss look on big driftwoods.