Moss Growing on Rocks in an Underground Fountain

Question

I have an in-ground bubbler fountain in my backyard. On the 4 large rocks, there is an incredible amount of moss (almost like sea weed) growing all over the rocks. It’s very unattractive and difficult to physically remove. Is there anything I can put on those rocks to eliminate the moss? Any suggestions to aid me in ridding the moss will be appreciated.

Answer 1

Adding something to the water, like lime, to raise the pH and make the area less attractive to moss.

Answer 2

I have a small 3-tiered rock-like water feature on my screened-in-porch. It get mossy during the warm months so I take it apart and clean each part with a stiff brush and strong steam of water from the hose. Let it dry in the sunlight and then put it all back together again.
I do put about three inexpensive goldfish in it with a plant or two. They love it as well as do my dogs!! Dogs will sit for hours just watching them swim but do not try and catch them. My granddaughter thinks it is 'cool'!