I would say you have some kind of nutrient in your tank or else why you have
so much algae battle.

Testing for nitrate will not be usefull since your algae are obsorbing it.
It should read close to zero or untracible.

How are your water circulation?
How does your Romora Skimmer skimmate look like? Does it get dark and
smelly?
I assumed your are using RO/DI water?

Adding more snail are one of many tool to battle algae but you are not
focusing on the source of the cause(s).

CapFusion,...



"Dave" wrote in message
...
I'm considering doing water changes twice a week rather than once, only to
remove more algae before it has a chance to grow back.

Think adding an algae-eating blenny would be a good idea?

- thanks
Dave