Drug info - Can the difference in trip be due to differences in LSD?

[Treebierd]

Recently my goldfish, Merl, took 3.5 hits of a new batch. While on his adventure, Merl started having a bad trip. Confusion set in and he couldn't figure out what was going on until a few beers were able to calm him down. This trip during the first 4 hours, was minimally visual compared to other trips where a similar dose was taken. Out of 6 other friends tripping, 4 had a bad trip. Merl started to think of the possibility of a batch of lucy being "bad". Also is it possible for differences in the chemical structure to change how visual a trip will be. I wouldnt imagine that being possible at first thought, but Merl has noticed that certain sheets have given different trips. For example, with one type Merl saw trees breathing and ants crawling on the ceiling each time, and others have given totally different hallucinations. If indeed Merl has different trips due to factors other than mindset, what would they be?