Having not as much surface area of the water could be an issue since you have a tall tank. What kind of filter do you have- is it one that hangs on back that circulates water? It kinda depends on what kind of filter it is as to how long you can rinse and reuse pads for or if it uses cartridges. Do you know the brand of your filter or can you tell us what the pads look like? How tall is the tank? I'm trying to visualize the "column." Is it literally round? I'm just wondering how much surface area there is.
I would not suggest adding cycle. I try to avoid adding lots of chemicals in an effort to get rid of nitrates because the best way to get rid of nitrates is water changes. As you said, increasing your water changes gets you off to a great start in lowering those nitrates.
Since you have bottom dwellers, schooling fish, and guoramis- you do have "levels" in your stocking. What I'm trying to say is that you have fish living in each part of the tank- bottom, middle, and top. I'd be more worried if you said you had all bottom feeders or something. Your fish are naturally spread out in swimming areas. I don't know if that paragraph made any sense
Just keep an eye out for if your fish's health appears to change. If they look and behave normally, there probably isn't an issue. They may grow, though.
The kind of filter and oxygen exchange at the surface could impact your water quality (like nitrates) Since you don't have as much surface area, it may be a little more difficult to get oxygen exchange.
I would not suggest adding cycle. I try to avoid adding lots of chemicals in an effort to get rid of nitrates because the best way to get rid of nitrates is water changes. As you said, increasing your water changes gets you off to a great start in lowering those nitrates.
Since you have bottom dwellers, schooling fish, and guoramis- you do have "levels" in your stocking. What I'm trying to say is that you have fish living in each part of the tank- bottom, middle, and top. I'd be more worried if you said you had all bottom feeders or something. Your fish are naturally spread out in swimming areas. I don't know if that paragraph made any sense
The kind of filter and oxygen exchange at the surface could impact your water quality (like nitrates) Since you don't have as much surface area, it may be a little more difficult to get oxygen exchange.