Milky Bloom And Deaths

Fred37

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Hi Folks,

OK, I'm running out of ideas and need some expert advice I think. Approx two weeks ago I was doing a 15% water change (which admittedly was probably about a week overdue) as I had seen my nitrate levels rising. As per usual I gave the filter media a gentle rinse in the removed tank water and immediately returned it to a running pump. However, almost as soon as I'd finished the water change the water went very cloudy....almost as though smoke were blowing through it - I understand this to be a bacterial bloom. The next day my nitrate levels and ammonia all shot up and so I added AmmoLoc. From that point on I started losing fish (Gourami, tetra, danio, platty).
After 2 days I went back to my LFS and they told me to leave the tank for a further 2 days and then do a 15% water change followed by a 10% water change after a further 3 days.
I followed the instructions but after 3 days there was no improvement in the milky bloom and so I added a second (Fluval) filter to try and increase my filtration efffectivity. Now after a further 2 days the bloom has all but disappeared and I've had no deaths for 3 days.

However, whilst my free ammonia looks OK (Seachem ammonia multi-test kit), my total ammonia and nitrate readings (API Master Test Kit) still aren't right and I was wondering if anyone can offer any guidance/reassurance?

Tank size: 64l
pH: 7.4
ammonia: 6.0ppm (Total) & ~0ppm (Free)
nitrite: 0ppm
nitrate: 10ppm
tank temp: 76

Feeding regime: Small pinch of flake food every 3rd day.

Fish Symptoms (include full description including lesion, color, location, fish behavior): Have lost 6 fish in the last 10 days. They all just started slowing down and then basically died. No other visible symptoms.

Volume and Frequency of water changes: Currently every 3-4 days 10-15%, before that it was 15% every 2-3 weeks.

Chemical Additives or Media in your tank: Interpet pump/filter with standard sponge and JBL Filtax Micromec balls.

Tank inhabitants: 2 zebra Danios, 1 Platty, 1 Molly, 2 Harlequins, 1 Cherry Barb, 3 Amano shrimp.

Tank decoration: 2 plastic plants and 4 living plants (various types...not sure of their names though).

Recent additions to your tank (living or decoration): None

Exposure to chemicals: Normally nothing except Interpet Flora Boost. Per above I have used ammo-lock to try and control spike but have done 2 10% water changes since then.

Source water: RO (no added minerals) from Maidenhead Aquatics.
 
Your tank was overstocked before the fish died.

You should really be doing a water change once a week with the tank being fully stocked.
When you preform a water change do you do a gravel vac.
Remove ornaments and give the substrate a good hoovering.
How long has the tank been set up.

When you added the second filter did you soak the new sponges in tank water and seed them by squeezing some bacteria onto new sponges from the other filter sponges.
 
Hi Wilder,

When I looked at all the advice on stocking I thought it indicated a max of 20 fish....but you are saying that 13 fish and 3 shrimp is overstocked for a 64l tank?

I always do a gravel vac, but only remove the ornaments about every 3rd time.
The tank is well over a year old, but underwent a housemove about 5 weeks ago. It was only a short distance move and so I retained the tank water and the filter was only not running for about 30 mins...everything was fine for two+ weeks following this and so I don't think that was a contributory factor.
No I didn't 'seed' the sponges in the 2nd filter like you refer to, wasn't aware that's how you did it....learning every day ;-)
I did another 15% water change last night and have just checked the water for ammonia....my Total ammonia is still showing at around 4.0 ppm.
Why is the ammonia taking so long to come under control.....I've now completed 3 water changes totalling 40 lites (62%) and am still only feeding a VERY small pinch of food every 3 days?
Thanks,
Fred.
 
Your ammonia high as it sounds like your other filter cycling.
Take new filter sponges out and squeeze old filter sponges onto the new sponges to seed them.
 
Your ammonia high as it sounds like your other filter cycling.
Take new filter sponges out and squeeze old filter sponges onto the new sponges to seed them.


Hi Wilder,

would I be better off just removing the 2nd filter/pump now instead?
Regards,
Fred.
 
It's best to over filter a tank.
You could just add one of the old sponges into the new filter.
 

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