I'm about to buy a 65-70g tank next week to prepare for an octopus in 4-6 months. I'm a total novice at octo keeping but I've been reading pretty non stop about it for about two weeks. Two questions (for now): Will that size tank be big enough for a vulgaris or briareus? (My LFS guy said it would be). And I would really like a colorful aquarium. Do you have any suggestions for live rocks or coral with bright and vibrant colors? No anemones and sponges, right? Thanks in advance!