My Blue and Purple tang had HLLE in my 120 with a 60g mud sump. It gradually kept getting worse over the last 4 years even with Selcon and a variety of foods.
Over the last year it has just about completely reversed in the 220g. Still have a mud sump (110g) and quit using Selcon. Most of the electronics are the same and I use a grounding probe. I do use a Phosban reactor now but I've never had detectable nitrates anyway.
I feed them mysis, Formula flake and Cyclop-eeze. I don't know but maybe less stress in the bigger tank? There are only six fish. Could be ammo for the Tang police.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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