One more question could I get away with a group of six i the 20 long?
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You could also look into Neolamprologus Multifasciatus. Perfect for that size of a tank and they will extend their family and help rear the colony. You can always move some out when it gets a bit crowded. Do a nice shell bed and they'd be happy. You could even get away with adding a sponge filter to your current and it would likely be enough.