#### Tony Swinney

##### Member

I've lost a couple of fish today, and am trying to work out why. One of my SAE's died last night, and the other died this morning - each was breathing incredibly quickly prior to dying. I've now just noticed my oto has died too. All the other fish - 13 discus, 30+ rummys, botia striata, cory sterbai, golden nugget plecs, amano and mountain shrimp - all seem perfectly fine.

The only changes to the tank, are that I started dosing dry ferts, using an All In One solution 7 days ago. The week before that I was bringing the CO2 levels up gradually to get the DC to grass green. So for the last couple for weeks, the CO2 has been running, tending to be blue green in the morning and grass green by lunchtime. Water changes are done automatically at 5am, with about 15% of the water pumped out, and RO / HMA prepped water pumped back in by 6am. I've been dosing the 40ml solution at about 7.30am.

So firstly I'm wondering if the solution I made up is incorrect, so if anyone can check the formula below that would be much appreciated.

Otherwise I'm not sure what is going on. The fast breathing might have suggested too much CO2, but all the other fish are quite happy, and non have been anywhere near the surface.

One other thought - I added a 'Koralia 2' pump 3 days ago, running it for daylight hours only.

Any ideas ?

Thanks

Tony

The formula, from Nutricalc, and based on a 300l tank:

KNO3 - 5.22g 3 times a week

K2SO4 - 2.4g 3x/wk

KH2PO4 - 1.48g 3x/wk

MgSO4 - 13.53g 3x/wk

Trace - 0.91g 3x/wk

The pump doses 40ml / min so will be timed on for 1 min per day, which is the minimum the timer will allow. I've made up a 1400ml solution which should last for 35 days, so I'll replace it every month. Mixing for 35 days also means you can just multiply the above amounts by 15: (( #g x 3) / 7) x35 = #g x 15

So added to 1400ml of RO water is:

KNO3: 5.22g x 15 = 79g (rounding up)

K2SO4: 2.4 x 15 = 36g

KH2PO4: 1.48 x 15 = 23g

MgSO4: 13.53 x 15 = 203g

Trace: 0.91 x 15 = 14g

E300 Asorbic Acid: 1.4g

E202 Potassium Sorbate: 0.56g