Tank Filtration
Good morning nn...
IMO, your filtration is sufficient if you're willing to replace half the water in your tank every week. Again, IMO, if you do large water changes every week you don't need to over filter your tank.
I keep large, planted tanks and change a minimum of half the water in them every 6 to 7 days. I can use smaller filters, because the water changes maintain safe water conditions. The filters are simply filtering water that's already clean.
Don't rely on filter equipment to keep the water pure, the filters are just taking in very toxic water and replacing it with water that's a little less toxic. The only way you can keep the water in your tank pure is to replace a lot of it frequently.
The more water you change and the more often you change it, the healthier your plants and fish will be.
B