$25 for a 2" E. uataman is a good deal. If i didnt hate ephebopus i'd buy it.
It might not be mold, could just be webbing. If you're concerned then swab it out with a q-tip. If it persists and ends up being mold u can always rehouse. Rehouses are really stressful for the T's tho so its better to avoid it if possible. Its not like a bp where pulling it out of its tub is nbd