Any progress? http://www.barrreport.com/ is a good website to look into underwater plants fertilizers. Plantless aquarium with fish will be a good source of natural fertilizers, adding standard chemical substances (very cheap) as underwater fertilizers (like here: http://www.barrreport.com/showthread.php/2819-EI-light-for-those-less-techy-folks) to the system shouldn’t make any harm and is fairly cheap, just remember to not add CO2 to [...]