Carpets do need to be fed on a daily basis, the above info is right on. THough I do have one in a 30g tank that is host to a pair of Clark clownfish.You can keep a carpet in that size tank, but I would be selective about what type of carpet, and also be ready for a potential future tank size upgrade too, I think that minumum tank size is a subjective thing at best, but I am sure all can agree that if you want to keep one, dont plan on keeping much else in a tank that size, consider it a "dedicated" tank, it would be your best bet. The 150 HQI is well suited to one, so light isnt an issue, make sure you have plenty of circulation, and make sure all PH intakes are screened to protect the anemone too. The key to sucessfully keeping an anemone is doing as much research as you can.