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Yes you can use that. It's a bit more expensive as someone else has mixed it and packaged it for you. But you can't deny the convenience. Since you are doing this in a separate bucket (an old 1 litre ice cream bucket comes in handy), you can dose 1ml of potassium to 1 Litre of water. You don't have to throw away the water in the bucket. Just keep it for the next days treatment. If you want to throw it out, you can use it to water your plants in the garden. Fruit trees love potassium.

We are cheating a little, we swiped a load of algae from our main tank and squeezed it in the baby one. We've crushed up a flake or two though the day too. They are still darting about and seem to be content. x

dip them in malachite green.

I don't really think flake food, crushed or not, would work. If it was that simple more people would have bred amano shrimps. Get some spirulina powder. Or some TETRASELMIS ALGAE PASTE.