Can anyone tell me what these spots are? They're thick little things, almost like someone put a kids stickers on there or something. They just randomly showed up on one leaf about ...maybe a month ago, and slowly spread to two other leaves from there. Is it algae? This is my twenty gallon nursery tank, I have two other plants like this as well as some stem plants and an umbrella plant, and something that looks like a clump of grass. lol It's a nursery, so it's nice and planted with kids to eat everything. NONE of the other plants show any signs of spots or any other issues, I've also had them all longer, about half a year or more. They're bright and growing wonderfully. I've had all of them in there for a few months, I DID add that anubias about three months ago or so, I didn't see issues with it before, they just showed up out of the blue and grew. They're kinda thick little dots.
I have Seachem root tabs, zoomed 6500k lights(only about two weeks old, same brand before), I add in some API liquid fertilizer and c02 boosts every so often. Not as weekly like I used to, about once a month now. I also have trumpet snails and baby fish that just eat up algae, I never see it in there, and it's not on any of the other plants. Not so much as a speck of it anywhere else. The snails and fish completely ignore it.
Is it a disease, algae, or did I mess something up? Never seen the like before and I've had plants a few years now.
I have some photos, they got a bit smoky in the close-up, sorry. I moved them to the back of the tank away from other plants just in case.