Fish Die - Lack Of Oxygen

[clivealive]

HI

Just wondered if anyone could give an opinion on why certain fish always die in my tank.
i have had various goes over the years of keeping suckermouths or ansistus etc but these are
ok for up to a month then die. Also ive had 2 attempts at geofargus jupari or heckelli and these last
about 3 weeks. others with more than 1 attempt are severums ( 2/3 weeks then gone.

All other fish are always fine (even had a fish last 8 1/2 years in same conditions so no
Obvious water issue.

2 severums died the other day and got full water test at tropical shop and all tests showed as very good.

i really like the fish above and would like to keep them but apart from the expense its note wanting to risk more deaths.


Any idea's welcome

Clive.
J

 

[afireinside]

What size tank is it in?

Is it filtered? Heated?

What are the stats?

 

[clivealive]

What size tank is it in?

Is it filtered? Heated?

What are the stats?

48l x 15 w x 18 h
eheim 2218
not got exact stats as shop did water tests but very good as in very low
ammonia and niterite , ph ok they said was perfect really

thought might be oxygen related but have spray bar from eheim.

 

[Ace Of Spades]

What size tank is it in?

Is it filtered? Heated?

What are the stats?

48l x 15 w x 18 h
eheim 2218
not got exact stats as shop did water tests but very good as in very low
ammonia and niterite , ph ok they said was perfect really

thought might be oxygen related but have spray bar from eheim.

Would help if you could get your exact stats, cant you buy a liquid test kit over weekend?

 

[Colin_T]

If you have a high nitrate level in your tank then the new fish will stress after going into it, while the older fishes will be use to the high levels and unaffected.
Low oxygen levels can be fixed by have surface turbulence but if it was the problem then the fish would gasp when put into the tank and all the big fishes would die before the smaller ones.
You could have copper in the tap water. If you do water changes first thing in the morning copper from the pipes could be leaching into the water and this water gets collected and poured into the tank. Running the tap for a minute before collecting the water is a good way to reduce any copper in the water.
The fish you listed are quite sensitive to chemicals and you haven't listed the other species in the tank. What else have you got in the tank?

 

[clivealive]

If you have a high nitrate level in your tank then the new fish will stress after going into it, while the older fishes will be use to the high levels and unaffected.
Low oxygen levels can be fixed by have surface turbulence but if it was the problem then the fish would gasp when put into the tank and all the big fishes would die before the smaller ones.
You could have copper in the tap water. If you do water changes first thing in the morning copper from the pipes could be leaching into the water and this water gets collected and poured into the tank. Running the tap for a minute before collecting the water is a good way to reduce any copper in the water.
The fish you listed are quite sensitive to chemicals and you haven't listed the other species in the tank. What else have you got in the tank?

i dont have the problem fish as they all died but now have:
fish are as follows :
2 x tin foil barbs 4"
5 x denisoni barbs 3 "
2 x diamond barbs
2 x syno devorus 2"
1 x red tailed shark (black red tail)
2 x stripped barbs. 2"
3 x clown loach 2 "

thing is none of the fish gulp and all latest fish added are ok its just suckermouths, severums or geofargus that always die.
have tried these when all fish are doing well and at various points over the years, so its not an issue the causes problems with
loads of fish just those types.
obviously dont wanna add more fish now but want to determone why this happens.
copper in water is possible maybe but why just them and not others.
the spray bar causes terbulance from top and air from bottom of talk shooting upwards to surface.
as i say all current fish are healthy, doing well. just cant make sense of it.

thanks fore all comments so far.

 

[Wyld-Fyre]

Hi,

In my opinion, even though you have a fairly large tank, it sounds like your tank may be over-stocked. You'll then have a lot of competition for food, living space, and air. This will then give rise to tensions in your tank, which will inevitably lead to deaths. The more "passive" fishes will suffer.

I hope it goes well....