Originally Posted by Tex Gal
DeChaoOrdo - I think the problem here is that it's very clear to the reader what HeyPK is doing. This isn't a science lab. HeyPK isn't claiming that. He also doesn't say that his results aren't anecdotal. To say that anecdotal evidence has not merit is just as incorrect. It's the anecdotal evidence that spurs people on to the experiments in the lab. Besides what HeyPK is doing doesn't have a down side. It doesn't hurt the plant, it also runs along with current literature and it's interesting.
All of us in this hobby have MOSTLY anecdotal evidence for the things we do in our tanks. We don't have labs. We don't set up elaborate experiments with control groups. We do what has worked anecdotally in our tanks. It's best to not be negative and just recognize that HeyPK is just doing something interesting at home and telling us about it.
I understand your point, but drawing conclusions off of experiments like this is what led to the common misconception that phosphates create algae and others like it. Again, I am not saying this experiment is meritless, simply inconclusive. Running experiments like this leads to a strong possibility of conflating correlation and causation which is why anecdotal evidence is such anathema in science.
A few more iterations with rest periods between would certainly strengthen the conclusiveness, though. Keeping documentation on the other parameters would strengthen it even more(and make it reproducible). Making a proper experiment doesn't require lab quality instruments(though they make it more reliable) simply lab quality procedures.