I just started a 75g tank about 3 weeks ago. I bought a Fluval 406 canister and I thought that would be enough, but I was advised to add a little extra filtration , so I added an AquaClear 70. I was like you, with experience only with HOB filters, and when I got the Fluval canister I was a little overwhelmed, however, over that past couple of weeks, as I have been working with it to get it right, I am becoming fairly comfortable with it, and I think it is a really good filter. As I said, I am also new to canisters, and this one is a bit heavy to move when full of water, but really does work very well. One thing that I found a little annoying, is that there is no troubleshooting guide in the owners manual. There are tons of "how to" videos on youtube. They are not perfect, but you just keep trying things and it is not so scary after a little while.