Oxygen

[Bremenguppie]

So I am running a 30 gallon tank. It's been up for over a year. I just did a 50 percent water change over the weekend. Before the water change I ended up loosing a tang I bought about 2 weeks a go. It started not looking healthy over last couple days. Over night I lost a yellow tang that's been in there for probably 6 months.. I've now got a clown fish that's been in there for a year. I checked the nitrates and they r normal. I dont use a sump anymore and just run the tank through a canister filter system. So could I not be getting enough oxygen in the tank all the sudden? I put a air pump in it for now just in case. Does anyone run a air pump on a regular basis? I'm wondering if it's not getting as much oxygen since going to a canister filter but I've had that running for probably a couple months and do water changes about every two weeks. Just curious

 

[j.falk]

If you didn't have enough oxygen in the tank your fish would be at the top of the water gasping.

 

[Bremenguppie]

Okay. I must have something else going on.

 

[j.falk]

Have you checked your ammonia levels?

 

[Bremenguppie]

No I haven't. I need to get a new ammonia test kit.

 

[Uncle99]

That’s to big of a water change, why so big

 

[j.falk]

That’s to big of a water change, why so big

I was thinking that as well...also wondering if they siphoned the majority of the tank bottom at the time of the water change...that could've caused an ammonia spike.

 

[Bremenguppie]

50% seems to be about the usual amount by time I get the bottom all cleaned.. idk if I caused an ammonia spike or not. I'm taking a sample of my water to fish store tomorrow to have it all checked. My clown was struggling tonight too. I set up a 5 gal tank and moved them all to it and they seem to be doing better. I checked my salt level and it's at about 25 which is a little higher than I normally keep it. It's usually around 22 so I'm not sure if that's got something to do with it. Hopefully have some answers after going to fish store

 

[Bremenguppie]

I get a lot junk and waste after about two weeks laying on the bottom. I've got some leg hermit crabs, some emerald crabs, a horse shoe crab in the tank to try keep it cleaned up. Could there be something different I can try. I see other tanks that look so crisp and clean and I hear of guys say they hardly ever have to clean them. So what's the trick to that because I have not figured it out yet

 

[Jason9488]

What kind of tang?

 

[Bremenguppie]

A yellow tang and another one that was part of the tang family. I believe it was called a angel tang but not positive

 

[Bremenguppie]

So I took water sample in to be tested and everything was perfect. No nitrates..no ammonia..nothing. they said it was perfect.. then they tested the salinity level.. turns out my $13 meter was no longer accurate. I was at 1.30 salinity. They said that was most likely the cause. So I bought a better meter from them
. Took out about 4 gallons of water and put in just plain rodi water with no salt and got my levels back down to about 1.22.

 

[Uncle99]

Yes, that high salinity would be hard on fish.
The higher the salinity, the more difficult it is for fish to process (breath)
50% WC is too much