Hello well new to all this never had a fish in my life. I have a 40g tank with a 30 g sump and 100g proteinskimmer that is been running for 6 months. I had 3 damsels and a clown that did well for 1.5 months until I added 40 lbs of dry pukani rock. After several water chages everything went back to normal. I currently have 3 damsels and diamond goby and some greenpolys. Looking forward to learn from you guys.