Are you going to get a chiller for this tank? S. fontinalis prefer water temperatures in the 57-60F range, and rarely occur in the wild in water that exceeds 68F for any extended period of time.
Assuming you can keep the water temperature down to 66F (which is on the high-end), as well as keeping the water clean and the fish healthy in such a small tank, you're looking at about 2 cm/month of growth, optimally. A young fish will put on almost 10" of length in just a year if you keep it healthy at that temperature.
Have you considered some native fish that aren't game fish? Something like a darter, or any number of minnows or a small panfish would give you the "native" experience and perhaps be better suited for a 30g tank.
If you decide to go w/ the brookie, I'd try to get a steady flow from one end of the tank to the other via a canister filter setup with powerheads for a unidirectional flow to mimic a stream.
Assuming you can keep the water temperature down to 66F (which is on the high-end), as well as keeping the water clean and the fish healthy in such a small tank, you're looking at about 2 cm/month of growth, optimally. A young fish will put on almost 10" of length in just a year if you keep it healthy at that temperature.
Have you considered some native fish that aren't game fish? Something like a darter, or any number of minnows or a small panfish would give you the "native" experience and perhaps be better suited for a 30g tank.
If you decide to go w/ the brookie, I'd try to get a steady flow from one end of the tank to the other via a canister filter setup with powerheads for a unidirectional flow to mimic a stream.
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