I keep my f8 puffer with 8 bb gobies and a dragon goby. No probs at all, the f8 ignores them really.. I would think the same of the eels, as long as they ingore yours... 4 f8's in a 55 might be a little crowded for them. Usually 2 per 30g is cool, maybe just 3 f8 puffers would be fine. About the...