I have a 30 long aquarium. I got this tank off craigslist and it came with a broken Tetra EX70. The main tube was broken but I fixed it with some aquarium silicone. This morning the tube broke again but now its unfixable. I have an old aqueon 20 or 30 on it right now, but the impeller is busted on it and it stops periodically (Another Craigslist investment lol). The only fish in the tank is a GSP. I cant decide, I am thinking in investing in either a Aquaclear 50 or 70 or a Penguin 350B. Any suggestions?