Someone asked me what I’m using to dose etc.
On the S650 ‘frag tank’, I use Red Sea Foundation elements A B and C and also coral colours with Nopox via a Kamoer doser. I dose coral colours once every 7-10 days by hand though
Now in the bigger system, I use the Deltec Twin Tech 1500 Calcium Reactor and it’s an absolute dream to use. It might look like something from back to the future, but all you do is press a button to increase/decrease flow that’s pretty much it. It’s also simple to set up once you appreciate how I works with the CO2 being injected. And I think my CO2 bottle will last a lifetime with the amount it uses
It took me about 2 weeks to dial the flow rate in with testing alkalinity every 3-4 days and it’s now set at 9 litres per day of effluent (out of a maximum I think of 360) and it holds alkalinity at around 8-8.5 and I haven’t touched it in about 5 weeks and counting
I use Rowalith W (chunky version) as media and this also contains magnesium so it holds alkalinity calcium and magnesium were they should be as the coral skeletons dissolve.
For anyone thinking of running a large tank, yes you can dose elements traditionaly like I do on the S650 but it will get very expensive . The Twin Tech is expensive of course, but in the long run will be far cheaper and is so easy to use. I really can’t recommend it enough.
I also add Red Sea coral colours to the larger tank by hand, but not very often at the moment as it’s fairly new
There’s a short video here showing it and also the electrics etc at the rear of the tank