07-21-2014, 01:34 PM
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Check each of the fish you are considering on seriouslyfish.com That will tell you the habitat, water parameters, numbres to keep to have them happy and healthy.
Rummy nose tetras need a school of at least 10 to be healthy. And they are delicate, you need to maintain proper water parameters. I lost my school of 10 in 8 hours when my filter failed this past March -- I was out at the time.
Otos should only be added to an established tank, as they are vegetarians and need the algae. You can feed cucumber as a treat, but it has little or no nutritional value for otos. Zucchini - blanched - is very healthy for them. Mine also enjoy the blanched sweet potato I put in (for my mystery snails, as it contains calcium for their shells).