With 9 watts(I would go for 11 or 13 watts at least) I doubt the Hairgrass would do well, you can try sugar and yeast DIY CO2, the temp. at 25ºC is great, for the crypts, the roots should be just below substrate. Some small tanks do great without filter, as long as you keeps up with water change.
Go easy on the liquid fertilizer, also try to plant as thickly as possibleincase you get a algae outbreak.
As for the scaping, search around in forum for layout inspirations, the rocks, plants right now looks just to orderly to be natural

. I would suggest a triangular/island layout since it's such a small tank. Lastly, look for small leaves plants for such a small tank, it would helps tremendously.
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