Just curious, if you don't test anything in the tank, how do you know you
need to use biopellets? You do know that biopellets are used to reduce nitrate and phosphate, and you don't want either one to be zero, so you could cause more trouble than good by adding biopellets if they aren't needed.
If you want SPS, you'll definitely need to buy test kits for calcium and alkalinity, and should also get magnesium. Nitrate and phosphate are also important to monitor for SPS. As already mentioned, keeping a
very close eye on alkalinity is the most important parameter for SPS (aside from the tank getting too hot or something haha). I also like Salifert test kits. They are easy to use, accurate, and reasonably priced. Don't bother with kits like Nutrafin or API.
SPS are high-demand corals, some less so than others (like birdnest, poccilopora, stylopora, montipora). In order to be successful you either need horseshoes up your butt or you need to watch the water parameters.
