try getting some "dither fish." if the texas sees a bunch of fish swimming around (like tinfoil barbs or bala sharks... many choices), it'll feel like it's safe to come out. if it sees no fish swimming around, it may think that all the fish (even though there are none) are hiding from something dangerous. Give the light idea a try, but if that doesn't work, try getting some large schooling fish, or more cichlids (all about the size of tank).
A bunch of foot long fish (Balas , if they live that long) wouldn't be the best idea. My suggestion would be Giant Danios or Buenos Aires tetras, maybe silver dollars. Ideally something large enough and fast enough (and cheap) that it can avoid being killed .
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