2 gallons is probably not enough to dent the level of nitite. Fact is you just have to keep doing water changes (right ina row if needed) until that nitrite is down low enough. once you get it established as a low number you will be able to keep up with it more often.I would start by doing at least 4 gallons next time you do a change and see how that goes. In a 14 gallon tank a 2 gallon change is only about 14% or so, so you are only diluting the current amount of nitrite by 14% then letting it climb back up. a 4 gallon change will be a far more significant change, though may still not be enough. Keep going.
And once a day feeding is fine. Fish are cold blooded so they don't need calories to keep warm. The heater does that. Especially during this cyclign phase you don't need the extra waste in the tank. So feed half of what you have been doing.
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