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2 tds can come from any dirt or dust in the container. Might not be perfect but 2 tds is far from terrible from a store. Do yourself a favor and buy your own rodi
As for the overflow noise look into a hofer gurgle buster, will make it almost silent.
For coral you want your salinity at 1.026. Make sure use are using a refractometer with calibration fuild. The swing arm are almost always way off.
For the tank water level the amount of water going down...
I am on a phone so this will be brief, I will expand on it if needed later.
1. Buy a rodi and stop using two water. There is many things in two water that you can't test for that can kill a reef. Your phosphates are probably coming from there. Look into spectrepure units.
2. I would pass on...
Wasn't in my order because I just saw that chart haha. Going to pick one up soon. The true actinic consists of mostly pur for photosynthesis so it should really help with color and growth.
For the t5 users in the group I have a few questions because it has be an years since I used them.
1. What is your photoperiod
2. Favorite 4 bulb combo
3. Favorite 6 bulb combo
4. How often you changing bulbs
Thanks, Joe
Paul's 450 nm leds are already in the OR lights. And about power savings... I am using 100 more a watts now but my 200 watt heater no longer turns on. And I will gladly pay 5 dollars more a month for happy corals.