Enzo:
Expos is correct, in my opinion. A fifteen minute ride to the next tank, in terms of
real stress, is minimal. While the l/r was actually "shipped" by normal means (wet/damp isn't the same as actually "under water", that implies it's submerged), it wasn't subjected to such severe conditions that you're losing any flora or fauna. Do you see "dead things"? If not, then you have apparently done the shipping well enough that you haven't lost anything.
(So, however you did it, you did it right.)
The "brown algae" is a diatom bloom, and it
is normal for a newly cycling system, but it is by no means an absolute. The results you're experiencing are actually what folks moving a short distance can expect with careful planning.
This is why
bradsark's situation is presenting itself differently from yours, as well.
bradsark, don't add a clean-up crew just yet. Let the tank's param's do their thing, the diatomaceous bloom is a normal byproduct of excess nutrients. Shortening photoperiod is
one way to "help" the situation, but if it were my tank (with nothing
but l/r & substrate), I would not bother lighting it at all. I would also let the diatoms consume what they will, and not worry about anything until the water param's show the ammonia oxidation cycle has been completed. I can't remember if you've mentioned having a foam fractionator, if not, I'd strongly recommend using one (but I haven't got a brand suggestion). I also will suggest avoiding carbon.
Yes, the cooler the water, the more extended the cycle
can be, but that is going to also be affected by other factors. For instance, what if the temp is
so cool it actually causes a die-off? Then you may have a longer cycling period due to the time taken for the die-off to "complete" (accounting for those animals not stressed by the temps, but instead by the conditions achieved with die-off). Does that make sense? (Sometimes I wonder if I've stated myself well . . .

)
Also,
Mogo, a normal cycle is often (I think it's usually the case) going to take just over a month. Six weeks is an average, so it seems to me that it went as could be expected.