Hey guys haven't been around in a long time but saw this post on lions and figured would pop in. The P. Volitan Lion will get WAY too large for a 70g. These fish get to be 15", picture a basketball with fins floating in your tank and that is what these guys look like when adult. IMHO they need a 125g bare minimum. I just recently purchased a P. volitan baby (is maybe 2.5 inches) and is currently living in a 55g, but am resetting up the 209g which will be its forever home. P. radiata would be a much better choice as would the Dwarfs. P. radiata or P. antennata, and D. zebra would be good choices, all maturing in the 6-9 inch range. Anyway, hope this helps and good luck.