I woke up this morning and 1 of my two saddle back clowns are not wanting to swim he just lays on the bottom.. My tank is a 36 gal reef aquarium I have 1 carpet anemone 1 skunk shrimp a choco chip starfish 2 black clowns and two little crabs.. I tested my water and my high range ph is: 8.4, nitrite: 1.0ppm, ammonia:..25ppm and nitrates are through the roof at 40ppm this all happened in 3 days should I do a water change ice just been pouring fresh water in when it evaporates cause the salinity is always high. Any input helps thanks