Thanks for the comment, trenac.
The rocks are natural... They will eventually be engulfed by the plants growing to the right and behind them to create natural caves and bridges for the fish.
The castle will be overgrown and almost disappear into the "forest" to look like ancient ruins. That tank still has a bit of maturing to do.
More plants isn't the answer, really... Patience/waiting for the ones that are already there to regrow (from heavy pruning) is the answer
