1st Grow DIY Hydro 0.9m3 - 5 Strains

I had bought a cheap ph meter from amazon that broke on day one of the grow, and I couldn't find my old tds meter so decided to invest in a decent meter that would do ph/ppm/temp and display a constant reading (since I was going to monitor it with a webcam). I got a good deal on a bluelabs guardian from amazon and it was well worth the investment for hydro setup. It was really hot in my tent (attic in summer) and the solution in the tank was as high as 33 degrees Celsius so I needed a chiller and ordered the cheapest one I could find on ebay, 35L aquarium chiller 100watts. Didn't expect much when it arrived as it was a lot smaller than I expected but I was very pleasantly surprised at its performance, was easily dropping the solution to a constant between 19-21 degrees