I've got some Excel but haven't got around to trying it. What if you're
already injecting with CO2. Does it have any impact on shrimp etc? Will
my algae eating fish suddenly go hungry?

It says right on the label it canbe used with CO2. I've never heard
it harms shrimp; I'm not certain, but if it did I think we'd have heard
by now tht it injured shrimp/snails/invertebrates.

Algae eating shrimp eat many more thnigs tan just algae, in
fact I'd say their last choice is algae. They eat decomposing
plant material and the microorganisms that live in/on the
algae which will still be present on live plants. Plus they'll
eat fishfood as their first choice.

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