After the weekend had passed, I checked the containers to see if they had eaten any eelgrass. In the isopod container, the isopods had bitten the edges.
|Isopod and damaged eelgrass|
|Snails and damaged eelgrass|
While these results were good, the snails and isopods have not been causing the same kinds of damage in the actual experiment. They were put in to the trial tanks on Wednesday. On Friday, the eelgrass was inspected for damage. While I could see a couple of snails and isopods on the plants, I couldn't observe any damage. I did not take the plants out of the tank and do a thorough examination so there could have been unseen damage. However, the trial tanks do have diatoms in them, so it is possible that the snails have gone back to eating diatoms. The tanks will be checked over the weekend and next week to see if damage has occurred.