Spots on rocks

Mel254

Wondering what these spots are that have developed on a couple of my tank decos (rocks) and such. Also seems to be causing spots/breakthrough on my “algae wall” lol which used to be solid. I keep that one wall for him to munch on.
Anyway, Pics attached. Established tank, will be three years in Sept. One comet, 39 gallon bow. Weekly water change 20-30% gravel back and Prime. Alternate rinsing filter media. Three HOBs and three along filters. Fish acting fine and parameters with api liquid freshwater kit are nitrate 15 nitrite 0 ammonia 0 ph 7 but water is showing as very hard whereas usually has always been very soft (using test strips which I know aren’t as accurate but I don’t have a liquid gh/kH test yet. ) always and ready very soft and now very hard. Weird. Also I thought the hardness would affect the alkalinity but it’s still acidic :/ (always has been acidic, that’s the water here in town )
PS now that I think about it, the “spots” are all actually on surfaces that used to be solid covered with algae, like something is breaking up/eliminating the algae
 

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BigManAquatics

Several different fish will eat at algae. What kinds of fish do you have in there?
 
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Mel254

Just one comet
 
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BigManAquatics

The plants when i get spots like that, i scrub them off with a toothbrush under hot running water. Can do the same with the rest
 
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