I don't know, I wouldn't put to much faith in any of those site's recommendations. Yeah, Liveaquaria tends to be pretty good in terms of recommendations, but there is a lot more to it.....for example tank foot print. I think the length and width of the tank is more important than the volume in many instances. I think 36" of length is enough for a moderately sized pygmy angel. But then again, I have seen flames that were 6", which would go against the rule of thumb. 30 gallons is cool in my book.
where's me money