You're definitely heavily
stocked, but with the exception of the Tang/Mandarin, the remaining fish should be ine in a heavily stocked enviroment.
A 55g, IMO
, is too small for the Tang - which will need a lot
of space for swimming/grazing. I'd consider removing both the Tang and the Mandarin (which is a fish which should be kept in no less than a 75g tank, and with a refugium to reproduce pods
but I continue to get algae that doesn't appear acceptalbe. How can I better control algae?
Well, my first thought is that 5 Turbo snails is nowhere near enough of a cleaner crew. You need (again, IMO
) a good mix of approx. 40-60 snails (Turbo, Trochus, Margarita, Astrea, etc.). Some people would also suggest a couple hermits, though I don't like them. A brittle or serpent star for detritus removal would also be good.
As far as the algae, there are a lot of things to consider. Other than an insufficient cleaner crew, your bioload comes into play. The filtration/LR
you are using might not be able to keep up with the wastes produced.
Feeding is another factor - what, how much, and how often?
Another thought is the canister filter. IMO
, I would ditch any mechanical filtration, and replace it with a good skimmer.
I can't really comment on nuisance algae without knowing full tanks specs. Salinity & temp, cal & alk
levels, nitrates, phosphates, etc. Those readings will give us a better idea of what is happening in the tank.
How often (and how much at a time) are water changes done?
As I said, there are many causes of nuisance algae, and most often it is a combination of several factors. What type of algae is it that you are seeing? Any pictures?