yes can see the picture now...
looks like both are frogbits... one have more leaves one is still growing...
They propagate differently.
The one on the left branches out very quickly and is almost always "flat" to the surface of the water.
The one on the right is always an individual unit and doesn't branch out. It maintains a "circular" form.
Their differences in shape and way of propagation seems to suggest 2 different species.
Hope I'm making sense.
Not sure about different species, but usually when frogbits are crowded together (ie. when they are bunched up at one corner of a tank by the flow), they run out of surface space to grow horizontally and start to grow leaves in a more compact manner, sometimes even growing leaves upwards in layers above the water.
Most likely the one on the right with more leaves was probably growing amongst a crowded bunch in your friend's tank, while the one on the left was growing in another area of the tank with more space.
One thing i've learnt from my experience growing frogbits over the years, they can have very different growth patterns, shapes and sizes depending on environmental conditions. Main reason i know is because i only started with just one frogbit leaf a few years ago (took it from a friend's tank to try) and over the years it grew to cover multiple tank surfaces many times over and i was able to observe all its different growth patterns, all originated from that one single frogbit leaf at the start.
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