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Can someone please tell me what this is ?

I have 125 gallon with a sweetlips clown , ocelus clown , firefish , few small crabs and a serpent star . It has been a month and the tank last week had high nitrites and nitrates . Tonight ph is 8.4 , ammonia 0 , nitrite 0 , nitrate 0 . Absolutely perfect . They spiked then dropped off . There...

Is it common for levels to be all out of wack for a while ? We were told we could put the agronite sand and stability in like the directions say n put a couple fish in to get it moving . Levels were fine for about a week the the ph went up and now the ammonia and nitrate levels are high . I have...

I have a 125 gallon saltwater tank with probably 75 pounds of base and live rock , a fire fish four little crabs and a clownfish . I want to go reef with fish . I have three 404 fuvals and two 402 powerheads . Are the powerheads too much ? I know you need as much flow as u can get and oxygen is...

We have 3 fluval 404 filters and one is leaking. It leaks where the clamps are. We have tried everything, even replacing the o ring. Any suggestions???

Is it bad to buy fish online ? Ive seen some pretty good deals online that stores around me dont come close to .

I have a 125 gallon tank with all the pumps and powerheads and everything to keep it going . I am new with saltwater and i want to do like live coral plants , and obviously fish . What are the pros and cons of using sand or crushed coral ? I think i want sand but is it a bad idea ?