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Cardinal fish mystery


solasido
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Anyone experience the same in keeping a school of red spot tail cardinal or yellow stripes cardinal fish, where when keeping a school, after 1-2 weeks the fish will start disappearing 1-by-1 until only 1 left?

I do not think there is cardinal fish predator in my tank.

The cardinals were feeding well.

Basically this is the 3rd experience of such thing. First time was a small school of yellow stripes cardinals, the red spot tail and recently another school of red spot tail. All after a while, disappear until only 1 left.

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The basic risk of adding many fishes at a time still exists... Sudden increase in livestock will increase ammonia and nitrite quickly due to bacteria not being able to denitrify the waste products fast enough...

In my opinion, growth of bacteria is really slow especially anaerobic bacteria... So sometimes it may be wise to increase feeding 2 weeks just before adding livestock to allow your bacteria to accumulate... Then when introducing your school, ease off your feeding regime and dose bacteria at the same time...

My 2 cents worth from my experience...

Angel Keeper

http://www.sgreefclub.com/forum/index.php?/topic/128217-Angel-Keeper's-5-Feet-Mixed-Reef-Tank

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Does not looke like the cause of ammonia as well since all other fish and anthias-es are doing well. No apparent diseases as well, at least not visible to eyes.

Initially I noticed that the male Lyretail is aggresive towards the cardinals but the second day it tolerates it. The school was intact for 2 weeks where suddenly 1 by 1 starts to dissapears.

Anyone keep school of red spot tail cardinals for at least few months?

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Maybe so... Did you test your parameters before you put the new fishes in and when the fishes started sinking? New fishes are adapted to near zero nitrates while your existing fishes may have gotten used to higher tolerable nitrates...

Angel Keeper

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You have to crowd them, as in you have to have a lot of them (not anything less than 10pcs). If not they will just kill each other. Alternatively have a really big tank.

  • Like 1

Always something more important than fish.

http://reefbuilders.com/2012/03/08/sps-pico-reef/

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So need big crowd

6.5 * 2 * 2 + 3.75 * 1.5 *1.5,(Decomn on 14/9/08)
4*2*2 + 2.5*1.25*1.25 (Decomn on 1/8/09)
5*2*2 (Fully LED light system, 140 3 watt SSC leds with 60 degree lens)(Decomm)
2.5*2*2(Fully LED Light System,96 3 watt SSC leds with 60 degree lens)(Decomm)

5*2.5*2(LED only)

Eheim return 1 * pump

1 HP Daikin compressor with cooling coil
2 Jebao OW40, 1 ecotech MP40,
1X6085 Tunze wm,

1 CURVE 7 Skimmer

  1 DIY 80 led control by Bluefish mini 

1 radion XR30W G2, 2 Radion XR15G3

Sump area lite by 5 ft T5 , 6 * SSC 3 watt red LED for refugium

1 Full spectrum E27 led light

1 CR control by bubble count

Start No Water Change since 1st Dec 2016

Add new 2.5x2x 1.5 ft 

 nLekOfpYts.jpg
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