It is generally NOT a good idea to rely on a 2 pump setup like yours. People usu. have problems balancing the flows of the pump <and even if you get them balanced at one point, it gets unbalanced a few days down the road with a bit of dirt or whatever.>
You are also risking floods ..... If any of the pump quits, you can flood either the sump or the main tank. Although you can have both pumps at the water lines (in the sump as well as the tank) to prevent flooding, your waterline will change with evaporation and you risk the pumps sucking air. And if one pump die, the other pump will be running on empty, which will kill that pump.
80 gal FW with 30 gal DIY wet/dry/sump.
9 fancy golds, 1 hillstream loaches, 1 rubber-lip pleco (C. thomasi), 3 SAEs, small school of white cloud minnows, planted.