12-29-2009, 10:55 PM
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For folks like me that think in degree of hardness that's 14 that in combo with a pH 7.8...there's actually quite some Cichlid and Livebeares that would enjoy that kinda water. If your tank was larger (like min 55g) I'd def recommend your Rainbows, they'd love that water.
Why do you want algae eater, not necessary unless you really have some serious algae to feed on (and then you had other issues in your tank too).
So yea you can't have most Tetra's but the rest of the world is open to you, only limiting factor I see is the 20g. So find some smaller cichlid for that tank that you like