Hi everyone my tank was cycled for 7 weeks n finally after testing water I brought s pair of clownfish. It's been 3 days But I think I am in trouble both of them r staying at the corner of the tank one of them is jus lying on the sand n other one beside it... I can see it's fins moving not dead yet but I think it's gonna die.... What is the cause..... ??? Pls help.. I tested ammonia it's fine......