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I have some that are a few years old and not more than 2-3" across and some that are the same age and well over 8-10" across. It all depends on the strain of RBTA, flow, light, available nutrients, etc. No real rhyme or reason for it, as they are all from the same chain of splits.They look like rainbow BTAs to me too. But what I find interesting is how small they are. What's the biggest size they usually get? Mine are usually only that small right after a split.

