So over the weekend my dad pushed me to make an impulse buy on a 125 gallon aquarium on Craigslist for pretty cheap. The add had like no information on it, so when we got home and looked at the filter, it was a fluval aquaclear 70 and obviously won’t work for the tank. My question is, what can I use to filter the 125 gallon, and is there something I can use in combination with the fluval aquaclear 70? Price is a big factor, but we are willing to compromise a little for reliability. Also for like $60 there is an eheim professional 2 (either 2026 or 2028) on Craigslist right now, and would it be worth it to combine that with the aquaclear and another filter?