the 70 would be fine but i think always better to have 2 filters.so 2 small ones over one large one.make sense.tks4d2 said:I was wondering if any of you have an aquaclear 70 (for 30-70g) running on a 29 gallon tank. Should I get an AC50 or an AC70 for a tank of african cichlids? Would it be worth spending an extra 10 bucks on a larger filter? I would really like your opinioon!