thanks everyone.
harndog. a 175 can hold several more fish than mine can. 2 tangs, a lion, a puffer, and an eel in a 175 is not pushing it at all. I have a lot of filtration on mine. a wet dry, skimmer, and large canister filter that has chemi pure and filter rocks in it. my nitrates are under 20, but I do a lot of water changes. my zebra eel is the major problem. he is about 4 feet and eats a lot, so makes a big mess. you will need a really good skimmer and great filtration since you'll have 3 messy eaters. I'd put the lion or zebra in first and the tangs in before the puffer.
the ribbon eel is a pain in the... he eats maybe once a week if I'm lucky. he makes my mandarin look like a fatty. still he is active and alive and has been for almost 4 months. initially i got a turkey baster and shot brine shrimp down his mouth. he didn't seem to like it of course, but most of it went down and it got him eating.
