03-29-2010, 04:59 PM
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IMO/E, a 10g tank is not big enough for a school of danios, these guy need lots of space to swim, good that you have a proper school though, I use 10g for spawning danios only...
Otos are really cool little fish and they too are social fish that do best in groups of at least 5 or more and will do well in a mature 10g properly stocked tank IMO/E, they tend to come in the fish shop pretty stressed and starved, it is best to wait until they have settled down and eating while in the pet shop for at least 2 weeks before getting them to increase your chance of success.
They tend to do better in mature planted tanks too, but as long as you have lots of places for them to hide and feed them daily with algae type wafers they can survive and as posted they love fresh veggies, mine love their spinach......
As far as the food, I see no problem and not a lot you can do anyway...I would, however, try to feed the betta in a corner to insure that he gets his fair share of the pellets, the danios are pretty fast and can consume the food faster than the betta, get some algae wafers and drop one in for the oto too.
Do you have live plants? and with your bioload, I don't know what kind of husbandry you practice but if you are not already I would make 50% weekly water changes at the very least, what kind of filtration do you have?