Yep, brown diatom algae. Its common in new setups.
It should stop growing after the tank has been setup a couple months. You can wipe the algae from the leaves. It should just come right off.
Can you take a picture of the bottom of the other 2 plants? They look like Anubias which shouldn't be planted in the substrate. The rhizome (hard stem-like part with roots and stems growing out) will rot if planted. I'm just going by leaf shape though. A picture of the bottom will confirm if it has a rhizome or not.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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