How big can I go while keeping the same light?

[OCDP]

Bev, when the time is nearing to setup the new tank.. I'll definitely be coming to you for BA removal advice! Thanks for your offer

Ever since I've had the blenny he has been very, very timid and shy. This is not typical lawnmower personality (from what ive read) The only reason I would remove him now is because it's easiest. I wouldn't be able to (not easily) remove him in the new system. He also does not eat prepared foods.. and I fear one day he will just starve to death on me.