rub off the algae with your fingers. should come right off. You could have "thinned" out the bunches of grass even more. It will grow and spread faster. Your going to be waiting a really long time for that to grow out and thicken to the density of what you have planted. The thinner you plant it, the quicker it will spread and fill in.
Love the hardscape! Some more anubias or java fern would be nice on there. Even some moss.
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~Glenn |