Hi everyone. I have a 12g nano without a skimmer. Filtration is 3 sponges, cleaned weekly, dr. G's nitrate remover and Seachem purigen. I have two clownfish only and a variety of soft and lps corals. I change one gallon weekly. I feed the clownfish daily only as much as they consume immediately. The tank is 4 years old. Corals and fish are happy but corals growing slowly. My problem is that my nitrates keep creeping up. They're between 10-20 right now. I over fed coral a while back which didn't help but I did a 3G water change then. I know the sponges don't help, but I need them to filter out the detritus. I threw in some more dr. G's yesterday to bring the nitrates down. Any thoughts on management of nitrates in a tank this small? I've seen posts about carbon dosing and nopox but I've also read that those are risky with a nano. I wish nano skimmers worked as that would make my life so much easier. More frequent water changes/sponge cleaning would be tough timewise but I'll do them if that's the only solution. Any and all suggestions would be helpful!