Loving all the help thanks. I just have a few questions whats the difference if i get salty shrimp GH and KH+ to remineralize instead of baking soda? I cant start over right now because I dont have a RO DI unit or other tanks I do have a smaller one but I would prefer to restart a tank that I would like because like I said I want to have a rack for 4 tanks in my room. And if i restart a tank it would need to cycle it. By that time 2+ shrimps would most likely die once the cycling process for that tank ends. And that sucks since I've grown attached to the last 6 shimps I have. And what RO DI unit would I need if I only have 4 ten gallon tanks in the future? Would I really need a 50 gallons per day or 70? Idk much about the RO units I've barely started looking into them and they are quite expensive. But I would prefer one since I dont want to go to the store every week. And also I have searched some RO DI units and some come up as RO and RO DI I know reverse osmosis and Deionization but wih the ones without DI do they not have Deionization or is it just a marketing act to shorten the name?
There's absolutely no reason to tear the tank down completely, that is terrible advice. I'm not sure how we go from "I have some shrimp dying" to "you need to burn it down, start again". This doesn't show discipline, it shows a lack of understanding.
RODI will give you 0 TDS. "100%"-ish pure water. RO units don't have the DI stage and will have some level of TDS. My water is extremely hard and has a TDS out of the tap 300+. An RO unit alone wouldn't get my TDS to 0, I'd be in the 30-50+ range, I need the extra DI to do the final removal.
I would suggest you seriously consider the unit I posted. It is a GREAT bang for your buck and a seriously quality unit. As far as flow rates - at 90 GPD, that's 3.75 GPH. That means you have to wait over an hour for your 5 gallon bucket to refill, and you have 4 tanks to change. Time consuming, right? Imagine an even lower flow rate. I actually purchased a 55 gallon water storage barrel to make water and store it for when I need it, this eliminates my wait time. This may not be an option for you, but thought I'd mention it.
I would not purchase a pre-made product to remineralize. There's no advantage (other than ease of use) and it costs more. MgSO4 and CaSO4 are all you need for GH, and sodium bicarbonate is all you need for KH. All three compounds can be readily found online, and baking soda is available at your local grocer as well. You'll add Ca:Mg in a 3 ppm:1 ppm ratio, this works very well. A 4:1 ratio can be done, I've always stuck with 3:1. So for every 3 ppm of Ca you add, you'll add 1 ppm Mg. You can use Rotalabutterfly.com to do the calculations. You'll want to remineralize your water to no less than a GH of 6.
No disrespect to Laura, but I would steer clear of the RO Buddy. Expensive replacement cartridges that are going to be quite short lived with water like yours.
Additionally - your shrimp need certain minerals and vitamins to thrive. You'll need to make sure you're feeding them a high quality food and adding some of the trace minerals to the water.