This is my collection. I have been growing N. veitchii, argentii and smaller two campanulatas for 1 year, C. follicularis Hummers giant for 6 months and H. minor and 2 bigger campanulatas are added recently. They grow on windowsill that has 2h of direct sun in the afternoon and I supplement light with LEDs. Veitchii and campanulatas grow in open top small hexagonal aquariums. In the evening I spray them and run humidifier for 1 hour.