To be honest, I'd skip the tems if I were you. Especially seeing as how you are getting a 300 gal. I had 4 tems years ago, and yeah they were cool, but they got to be real monsters that outgrew all my other fish, as well as my tank. I ended up taking them to work, (I worked for a public aquarium at that time) and putting them in the SA display tank. This was before keeping Cichla was as popular as today. I suppose you could sell them when they got too big, but honestly, you would probally lose money if you counted up the all cost of raising them to monster size, seeing how common they are today.