I'd be ok with using mounting legs. My questions are-what would you recommend as far as brands/where to buy?
Do they mount to the side glass? Does it look clean? I think it would look more sleek for them to hang.
As far as the Ca tester goes, I read in another thread people really dislike the Hanna for calcium as they feel it's not as easy to use. People like the Red Sea.
BRS has mounting legs that Giesmann makes; you'd know those would fit.
I have Radions and use the RMS mounting kit; that just sits on the top edge of the tank. I do agree it will look "better" if yours (and mine) were hung. For my part, I've not been able to figure out a design that I like. I would also suggest that regardless of how you mount the lights, that you are able to move them fairly easily. Even though my setup isn't as sleek as I like, I can remove everything in a few minutes if needed.
IMO, Hanna & Seachem suck for Ca (too tedious). I use Salifert; I may try Red Sea soon. Here is my philosophy on testing: Initially, I want to know that a test kit is accurate. To that end, I will measure using multiple brands and make sure they are close to each other (5% is acceptable to me).
Once I trust the accuracy, precision becomes more important. To improve precision, I want a kit that I can use and know that I will use it the same way over and over, so that any bias of my methodology (watching drops, matching colors, etc.) is consistent between readings. That way as I take measurements and enter them into ApexFusion (logging your test results is vital and a hidden secret in the hobby), then I can see trends in those readings and act accordingly. I don't really care if my Ca is 440, 460 or 420...I care that over the course of any 30 day period, my Ca only swings 8 points or less.
Taking this further, I like to bundle tests together, so I don't have pull out instructions each time. I test Alk most often. The Hanna checker for Alk is perfect for that. Nothing about that test is subjective. Fill cuvette to the line, put in tester, add a set amount of reagent, put back in test, read value. Easy peasy, lemon squeezy.
When I test Ca, I also test Mg. Because of that, I use Salifert for both. I have a nice 3D printed tray that holds everything (syringes & scoops included) in order, so I fill two containers, and essentially do the same thing for both sets and get my readings. Simple.
I suspect Ca & Mg from Red Sea are similar.
Hanna has some great checkers; some are PITAs. Same with everyone.