i have a 3 gallon pico and i challenge everyone to something. full running tank for less than 100$ in equipment. so far mine has come out to about 65$. for a ato a grow light and a clamp on fixture and a pump. the growlight should heat the tank but i do have a nano heater if need be. this is just a idea rn. id either do some clown gobies and other obligate coral dwelling fishes with natural wild caught sps and make a coral dominant tank or i would do macro tank with a feather duster, some softies, and a brown rock flower and gorgonians. it has a vertical footprint. i was either thinking a few different gobiodon or rough head blenny and hasslet goby.





