As mentioned above, it depends what type of algae you are blooming. At this stage in your setup it almost sounds like diatoms which is a natural part of the cycle and will die off once they run out of food.
Something else to combat algae in the DT tank is the refugium and perhaps a phosphate reactor. I have lots of snails that graze all over but I wouldn't say that they ever made a huge difference. My urchin does a lot of grazing too but also not a huge difference. In the end, my Tangs and lawnmower blenny are the true algae champs. Tangs go after anything green, blenny goes after anything not attached to the rock. Whenever I add a new rock that has any sort of algae on it the tangs and blenny polish the rock in a matter of minutes.
I realize that it is too soon for you to add fish so personally I would hold off on adding them until you figure out what type of bloom you've got. Again, if it is a diatom bloom it will pass, don't worry about it.
K.
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