Now that we have some of our new water chemistry equipment, we have discussed flaws in our first 18 samples. We collected all 18 samples with no tools to collect metadata (water chemistry). We have decided to take all the samples again and get rid of the 18 we already have. We still don’t have all the water chemistry equipment we need, but it should all be here tomorrow. It is crucial to determine the water chemistry at the time of every sampling. (During our study of succession on the coral ponds, this will be a lot of water chemistry testing!)

Good idea to resample. You could keep the 18 samples you have taken (without metadata) and use them to test things like DNA prep methods before doing work on real samples.
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