Im looking to put 5 ricordea polyps into my 12g nano after its cycled and the clesan up crew is in. I was wondering if this is too much to add at once? Id add them 1-2 at a time but id be ordering them online and would like to keep it to one order because of shipping costs and this is my only tank. I could do 2 water changes that week that I add them if I needed to.