2ft tank is small enough that i wouldn't want anything to take up excess space in the tank
overheads are ok, but they tend to outgas co2
if you intend to use flourish excel, that's not that much of a concern, but cylinder co2 will not be as effective
i would prefer an external filter
an eheim 2222 would be enough, but i'll go for a filter 1~2 sizes above what i need, in case i upgrade
prices should be about ~150+?
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