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https://www.marinedepot.com/Reef_Octopus_Classic_110_INT_Protein_Skimmer_In_Sump_Protein_Skimmers_for_Aquariums_Reefs-Reef_Octopus-CV5111-FIPSIS-vi.html
Here is a good starting point. The good news is that like I said everyone has skimmers so generally you can find them used. I have not bought...
First is external or internal; are you going to run it in your sump or have it outside your tank. Second is size and stocking, how big and what do you plan to keep. Skimmers are rated for gallon and then stocking so like for example a 50g light stock or 35 g heavy stock. Last question is how...
If you are going to add more corals you have to manage the nutrient export somehow. You can start testing your nitrates and phosphates now with the 10% water change and see how they measure and adjust from there. As the others have said, we run a UV but that is to help keep the fish healthy...
Yeah when I saw it this morning it said target was 5.6 which is what I responded too. Sounds like you saw the warning (rtn), tested and now you are going to fix it. Happens to all of us. Just keep testing.
If you really want to get crazy, you can setup a camera on the tank or have your buddy facetime you (if you are in the US). Mikem also nailed it, have a backup reefer that can be called if your buddy thinks something is wrong.
As someone who was very involved with the Camden experiment I would say don't do it. However, it sounds like something you are passionate about so I will at least try and give some guidance. (I also voted no in the poll).
Location: this is really what kills the project as a good location is...
Wrasses and especially coris can disappear for a while, let them be and don't disturb them which could stress them further. Also make sure you have a tight lid, as they can jump. Evap can change seasonally as supra said, check your refract if you are getting the same readings all the time.
You need to test your alk and calc and then you adjust your dosing to keep those numbers consistent. It takes a lot of tests and dosing in the beginning to get it dialed in, but that is what leads to success.