Cyano problem, need help

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also, i dont know if this is a clue, but in the morning before the lights are up, there is only a little coloration on the sand bed.. the sand looks mostly clean with some red/purple spots. As the aquarium lights intensify during the day, then the brown mat starts to intensify




I think I have amphidinium dino? All this time I thoguth it was cyano.


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Other mat forming organisms are also increasing with the photoperiod so it's not a 100% certain ID but Amphidinium is certainly a possibility as some of them apparently create less mucus and like to go a bit deeper into the substrate.