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When is it due? The only problem may be that the timeline doesn't allow for any difference between the two species in an identical ecosystem.

You could prove or disprove Byron's theory about the fluorite vs sand. Just use a number of identical short stems in each with the different substrates and still add some shrimp in each for interest with some java moss for added shrimp grazing area. That you will easily be able to measure.

Jeff.
 

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I've helped with lots of science projects over the years and we've done everything from power generators and batteries to tensile strength measurements.. I always find that something that can be measured is easiest to do... and we've changed projects mid stream as long as the teacher knows why ... but that depends on how much grunt work has already been done as to how worth it it is. Good observations can make up for empirical measurements if needed though.

Whatever you decide, have fun with it.

Jeff.
 

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If you are using sealed or sealable containers, the shrimp should be fine. If you can use plastic containers to avoid a breakage concern, that would be best. Then just sturdy fabric grocery bags to tote them back and forth in.

Jeff.
 
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