I have a 220 gallon very heavily planted tank and have 11 rams without problems. The tank has angels, tetras, cory's, and others. You just have to be sure to add DW and arrange plants so there are plenty of hidey holes, and different areas for individuals and pairs. Sometimes with all the plants you don't even see one. The only time I see them all is feeding time. That is the only problem with rams in a huge tank, you know they are there but don't always see them. As for problems, I've not had any bad aggression issues since they all matured months ago, and some of the males are at least 2-1/2 inches. I think down the road I'll let the numbers drop and get other fish that are more visable and enjoyable in such a large tank. In all honesty I think people can best enjoy having rams in smaller tanks that the rams are more visable in.