soil making fish sick?

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ehh

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Aug 30, 2013
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so i am convinced that there is something going on in one of my tanks that is making my fish sick. at this point I'm blaming the potting soil.

first.. i lost a cory cat to what started off as pop eye and turned into something else. she was showing signs of getting better then died.

second.. i lost the betta. no signs of illness. dead from one day to the next.

third.. another one of my cory cats is now sick. pop eye. it looks like its in its early stages, his eye is just a little cloudy but i found him floating this morning breathing heavy.

its ten gallon tank. heavily planted. 50% changes weekly. at night the temp is around 82 and during the day it gets around 88. we've been having 100+ days for about three weeks now, its a little hard to combat that. the tank has a base layer of some organic potting soil and top layer of some aquarium sand. the cory cats do a good job of digging up soil so every time i do a water change i end up gravel vaccing a lot of that soil out.

i feed them nls algaemax. once a day or every two days.

I'm going to break down the tank this week and remove all the soil and just use sand. unless someone else can come up with a reason that I'm losing fish.
 
I would stop adding fish and keep the tank like that until autum when temp cooling down and try again.
 
I haven't added fish in about year.

You think the high temps are making them sick?
 
It could be high temp but don't hold my words for that. I have a 10g tank heavy packed with pothos, fox tails, duck weeds, java fern and ton ton of snails, that I keep outside my house (patio) for years and all my mollies are fine with constant temp 88+ in summer and like 40 in winter but those are live and born in that setup for long time. I started with 4 mollies and now its population expand up to 40 mickey mouse mollies....I never change water LOL I just add water cause it's vapor really fast during summer and feed them once in while.
Notes:
These mollies was added to keep eliminate mosquitos larva.
 
really need some more tank info.... organic soil? what brand- hopefully not miracle grow- they add stuff to their soil. heavily planted, pics? are you ei dosing? are you carbon dosing(eg. excel)? are you adding CO2? if so, is it a DIY or do you have a canister and regulator?
 
really need some more tank info.... organic soil? what brand- hopefully not miracle grow- they add stuff to their soil. heavily planted, pics? are you ei dosing? are you carbon dosing(eg. excel)? are you adding CO2? if so, is it a DIY or do you have a canister and regulator?
Honestly, I don't remember the brand of the soil. I read on a few different sites that "organic potting soil" will do. Including miracle grow. But it's not miracle grow. I bought it at a local co-op.
The tank has a ton of anacharis in it. Like, 20 or so stems that I'm constantly cutting in half because the tank becomes cluttered.
I don't dose the tank with anything. There is no co2 set up. The anacharis grows so fast that the only thing I do the tank is water changes and gravel vac.
I'll take a picture when I get home from work.
 
There is also an infinite amount of Java ferns in there that I'm always clipping and throwing away.
 
Just cause the soil is organic doesn't mean it's safe. Need to look at the bag and make sure it doesn't have manure or fertilizer in it. Also for cats do not do well in water that hot. They like it slightly cooler. So either of those could be the problem.
 
Just cause the soil is organic doesn't mean it's safe. Need to look at the bag and make sure it doesn't have manure or fertilizer in it. Also for cats do not do well in water that hot. They like it slightly cooler. So either of those could be the problem.
I think I still have the bag because there was some left over. I'll look for it when I get home.
 
Cories prefer temps in the high 60's- low 70's. I would think any temp in the 80's would be bad for them. 88 sounds like a death warrant to me.
 
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