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I don't have rainbows but I feed Community to my tetras. I use an old medicine measuring cup. Put a hole in the bottom and thread a piece of fishing line with a fishing sinker through the hole so the weight is inside the cup. Then make up the food and pour it in and wait until it hardens. Then I take a knife and run it along the side of the cup to release the gel and hang in the tank. They go nuts as it tends to blow in the current, makes it more changing for them to get but they love it.
 

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Children Boogie
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I've seen people let it solidifies on a string, then hang the string in the tank. The gel will be available for top and mid water fishes.
 
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