They grow slow, but I agree about not having them in a 50g. Unless you know for certain that you will get them a larger tank in the next couple years.
If you go with those fish though, you should consider adding something that hangs out in the upper or mid levels, like a schooling fish.
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*Kristin*
5 Planted tanks:
55g, 40g, 29g, 20g, 5.5g
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