Just wondering how much you pay every month with water clean outs. Us here in Ireland will have to start paying for water because of The Stupid Polotician scumbags messing up our money. So if i have a 540Gal How many clean outs a month will i have to do with big fish?CKF,Arowana,TSNxLei will be in the tank. See i dont think i will be able to pay for it because im to young for a job(14). And i would not like to put my dad under presure with money. Or could i even keep cichlids like Severums and Hoplarchus Psittacus together and only have to do water changes like once a month. Like small fish=less clean outs?? Please reply i wanna keep Big fish.