Cephalexin and bio filter?

  • We are currently upgrading MFK. thanks! -neo
Keflex will affect ur beneficial bacteria.
 
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I haven't really heard of cephalexin being used for fish. What are you trying to treat? If the fish are eating I would always prefer antibiotics in feed.
 
Will it totally wipe out the BB? Or some of it? Because the question would be if there was something in the tank then it very well could be still inside the drum filter. SO I'm tempted to turn it back on and run the water through the filter too for maybe 3 days out of the 5 day treatment.
I should have enough water flow to keep any ammonia or nitrites from becoming a problem. Tank gets turned over 2X its volume daily. Fish have not eaten in several weeks prior but JUST started eating a little bit of activity this week.
Unknown fungus or bacteria. They have perked up and just started eating a little bit after 3 days of treatment, however the water temp has come back down too more their liking so that might be the deal too.

I don't really NEED a bio filter but it is sure handy in case of outages,etc. and if I kill it completely the time needed for it to cycle is insane. I can't put the fish anywhere else at the moment.
 
Can’t really say how much BB it’ll kill. As long as ur confident u can keep ur parameters then ur good.
 
if there was something in the tank then it very well could be still inside the drum filter. SO
hello; Yes it almost for sure is in the filter if the filter was running during the infection.

should have enough water flow to keep any ammonia or nitrites from becoming a problem.
Hello; My take has been that flow capacity of a filter system has little to do with removal of ammonia or nitrites other than as a delivery system to get the ammonia laded water to where the beneficial bacteria happen to be. For example tanks a can be run with only air operated sponge filters.
If in the 900 gallon tank there are only a few small fish then the sheer volume of water to the biomass can keep the ammonia and nitrite very diluted especially if you do enough WC.

don't really NEED a bio filter but it is sure handy in case of outages,etc. and if I kill it completely the time needed for it to cycle is insane. I can't put the fish anywhere else at the moment.
Hello; While 900 gallons is big for a tank it is still small compared to a natural environment. Again much will depend on the stocking density (biomass) of the fish.

Hello; Based on what is posted my take is the infection is also in the filter system. That the antibiotic likely will kill the beneficial bacteria as well as the infectious agent. That to get rid of the infection then the filter system must also be disinfected. In the end you will likely have to start a new cycle.

Good luck
 
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What makes you think you have a bacterial infection? Treating blind is a bad idea.
 
What makes you think you have a bacterial infection? Treating blind is a bad idea.
Hello; Yes to this. Not knowing what an infection is can mean that an antibiotic will have no effect on the pathogen at all. For example if it is viral or fungal then the pathogen will not be affected but the bb may well be damaged.
There are also at least two classes of bacteria as I recall. Gram positive and gram negative. There may be others as my knowledge may be out of date. Some antibiotics will work only on one or the other and not both. There are what are called broad spectrum antibiotics which I believe can be effective for both types to some degree.

I guess what I am suggesting is the OP may not be treating the pathogen at all and may be doing harm to the bb colonies. There is also the risk of undertreating and promoting the development of antibiotic resistant bacteria.
 
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