ok, ill run the skimmer wet chief, i just came back to my tank this afternoon, alll the major gunk, sticky stuff, huge huge bubbles, stopped...my skimmer is skimming back to normal...all i have is now 3 shrimp in a fish net tie wrapped in it so they wont come out....i only got .5 ammonia since yesterday and gonna be checking everyday till it drops...So, do you guys suggest a water change after my nitrites go down and nitrates are up? and if yes...maby 25 % ok? meaning more lil ones are better then lets say one or two huge ones?