The fluval pre sponge would probably work better it's what i use in my shrimp and breeding tanks. The Azoo sponge is more dense and will clog quicker possibly causing you filters pump to overheat. The Fluval will also have nitrifying bacteria on it maybe not as much but with your HOB and the pre sponge you should be good. I just squeeze my sponge when i do my weekly water changes to clean it out. You'd be surprised how much gunk will come out of there. You also might have vacuum your gravel every now and then since your filter won't pick up the big stuff with the sponge on there. Good luck your tank looks good.