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Primitive biofilms ---usually a sleazy mix of diatoms, cyanobacteria, dinoflagellates, etc.--- are usually found taking advantage of light, of present nutrient, the fact that there's nothing to consume/disrupt them, and the fact that there's litle to compete with them for nutrients and light.

If you are putting in additives of any sort, it might be prudent to try cutting back on such, as well as anyother nutrient (like most food can produce)

The downside to most any unchecked biofilm is that it can choke off small, beneficial organisms beneath it. Any subsequent deaths dump more nutrient that the biofilm then exploits further.


hth,
horge
 

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If by 'golf green' you mean something turf-y, with individual structures, then herbivores can be used as a control.

Snails are a weak, if durable option.
Sacoglossan slugs are a thorough but short-lived (months) option.
Urchins are sometimes an excessively-thorough option.
It all depends on the surface area and surface type to be grazed,
and what sort of algae are involved

I was earlier talking about (mostly-algal) bio-films... while there are herbivores for even those, such films are often more efficiently managed by hands-on, hobbyist intervention (siphoning or teasing off, followed by outright removal from the tank).

:)
 
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