jwong1024;3284815; said:Not sure if a 55gl WD is enough to filter a 400gl tank, was there any BIO filtration???5 days might be enough to kill off your BB. amonina spike is possible. If he stop running the 400 for 5 days before the rays were introduced then yes absolutely will the amonina sky rocket. The other thing you need to know is if the rays were eating before hand. CB or WC, if rays are not eating they will probably not eat now until they are acclimated. Another question to ask is were the rays deadly skinny looking?
Why isnt it? i got 2 wet drys built off of 29 gallons 1 is running a heavy stock 180 with no problems.... if there was no bio then what kind of wet dry would it be?

1 day is enough to kill your BB... if there is nothing for them to consume they start to die...