03-17-2009, 03:48 AM
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I would go with a single betta, The otocinclus feeds almost exclusively on algae and they do poorly in the absence of it. While you may find some of these fish that will eat algae wafers or vegetable supplements, many don't. The likelihood is not unlike the risk taken by some,, of introducing other fish to betta tanks. Some will get along with other fish,, but many won't. If you decide to go with guppies then another tank might be needed for all of the offspring. If you go with all male fancy tails (guppies) then in a small enviornment, I would expect some tail nipping by other males. If you place the tank near a window where it can get some sunlight either directly or indirectly which would encourage algae,, then Oto's would be a good choice. Keep the water clean.