If it is only the PC hood, then I would say no. If you have the sunpod then I would say it is possible.
The problem with anemones is they can get up to a foot across. Have you measured your tank? It is about 18"
What else do you hope to have in there? If you plan on having corals, I would say forget it.
That being said, there is a local to me that has a GBTA in a 34g, and it was in a 12g before that. Every time it starts to get too big it splits. It did fine for about a year, now he wants to get rid of it because it goes for walks all over his prized corals. Nearly stung his ORA birdsnest to death. Now he wants it gone. Just something to keep in mind.
dsoz