I think I'm finally at the point where I'm selling more than I'm buying, but that's not so much because of self restraint as the fact that I don't have room for any more tanks (though I've been eyeing the space under the 40 gallon breeder in the bathroom).
If you don't want to have to bother with removing the fishing line, you can use a dab of super glue to secure the anubias rhizome to the driftwood or rock. That can stay indefinitely, and is completely safe as long as the glue is cyanoacrylate.
I have given up on trying to get the Eheim heaters to show the actual temperature. I adjust the temperature to where I want it according to a thermometer I trust, and ignore what it says on the heater itself.
In that case I'd definitely do a water change. You don't want to let the combined ammonia and nitrites get much higher than that (definitely below 1.0, and again, that's combined, not just one of them).
They should start moving around more after they get familiar with the tank. I wouldn't worry about it too much.
I'd probably do a 50% water change to get the nitrates down to around 40 ppm.
If the pleco doesn't eat the wafer it's probably not hungry. If he doesn't eat it after a few...
That's my understanding also. When I was gone on vacation last spring the fry in my tubs outside didn't get fed for three days (other than what they may have found in the tubs), and I didn't notice any problems.
Pearl gouramis are usually much less aggressive than dwarf gouramis or bettas. I have eight of them in a moderately planted 40 gallon breeder, along with tetras and corys, and haven't seen any aggression issues.
No, do not replace the filter every two weeks. Even if it's the filter cartridge, and the manufacturer says to replace it often, don't do it. Rinse it and put it back until it's absolutely falling apart, and even then, leave it in the filter along with the new one for a few weeks so you don't...