Hi,
I had a 15g tank and was sold 2 gold algea eaters (aka Chinese algea eaters). I soon realised what a mistake I had made.
Oh yes they started out cute and funny to watch. They seemed to mix well with my silver tipped tetras and platies. At this point they were very small, about 1" but they soon started to grow. Even at 2" they started bullying the other fish. They even started on each other. At this point I found out that they could potentially grow to 10" (way to big for my tank) and that they could kill my other fish. I gave them back quick smart.
They need a big tank. Never again.