Flaxon-Waxon
Aquarium Advice Addict
The 1400's should be fine running at the same time. If you have other power heads as well, you can put those ones on the wave maker, or just run them all without the wave maker would be better.
Slow and steady wins the race.
Any TDS meter will do as long as you keep up with your testing baron. It is important to keep the number LOW from your ro/di. An inline is handy, but if it is cheap and works I wouldn't think twice about it.
+1 I have an inline because i have enough "Fish stuff laying around" My wife words
It's tough out there you need to find a niche and fill it Good luck.