Newcomer losing fish

glennmarch

Registered Member
Jul 26, 2008
3
0
0
Leicestershire
Hi folks.

I put this on the introduction thread and have been advised to place the query on the Freshwater one so here goes.

I got a new Fluval 125 litre tank 7 weeks ago. I have a sand substrate with vaious live plants and wood decoration.

I have been using Hagen test kits and so far the levels have constantly recorded the following figures with no change

Ammonia 0.1
Nitrite 0.1
Nitrate 5.0
Phosphate 0.25
pH 7.6
dGH 13.44

I had gradually built up to 10 Neon Tetras, 6 Black Neons, 6 Platys, and 6 harlequins. They seemed to be OK until last week when the Platys started to die. Last weekend i did a 40% water change last weekend up to then had been doing weekly 10% - 20% changes and then noticed that one of the Neon Tetras had what appeared to be whitespot. I did put some treatment in for that as dictated on the bottle (Protozin) the final treatement was last night. Since then i have lost all the neon tetras and am currently left with just 2 Platys, 4 Black Neons and 3 harlequins.
This afternoon one of the remaining harlequins seemed to be having difficulty swimming and has since completely dissapeared. I have taken out the wood to give me a better chance of find it - to no avail, but dont want to remove the plants if possible as they are just taking root nicely.

Can anyone give me any advice what to do? I dont really want a rotting dead fish in the tank if i can help it.
 
Sorry you're having problems.

Water change to reduce ammonia and nitrite to 0 whenever they are detectable.

Welcome to AC :)
 
I am not familiar with that medicine..it may have killed your beneficial bacteria..
 
I havent seen any further signs of whitespot but have lost fish every day this week. I did about a 20% water change yesterday. Should i be doing this more regularly than weekly to get the tank cycled. Obviously i dont intend adding more fish until i can sort this problem out.
 
I would do water changes as often as needed to keep ammonia and nitrite as low as possible, preferably zero. I have done up to 80%+ more than once in a day to accomplish this.
 
Great looking tank! As previously said, big and frequent water changes will get you through. Once fully cycled, it will get uch easier. m
 
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