I'd be cautious with adding smaller tangs. There aren't many that you can keep with such a large front. Frontosa are optimistic feeders. They will get a long for months, even yrs, and you'll grow attached to em then the next day they are gone. Another problem is that some tangs such as daffodils, brichardi, and leileupi are much more aggressive than frontosa. If they start to breed they will harass frontosa. maybe pick his eyes out.