Hi. I am planning on getting a 30 Gallon tank and I am still doing some investigation. I see that the Bio-Wheel is excellent. The problem is that in the country where I live (in Central America) they don't bring the Bio-Wheel. And ordering it online is no problem. The problem is at Costums, where you end up paying the double of what the article is worth. The point is I can't get the Bio-Wheel. What would be the best alternative? I hear Aquaclear 200 is very good. It is rated well on this website.