Tank smells like rotten sushi

  • We are currently upgrading MFK. thanks! -neo
What product are you using as a dechlorinator?

Also check under the top aquarium trim for uneaten food or gunk.

+ what Fat Homer suggested!
 
The others have already given good advise so I won't add to that at all. One other thing I'll say though to help prevent another issue. I can see in the pic that your heater is on and your water level is way below the minimum level for a heater. Don't let the water lavel get that low because there's a good chance the heater will end up popping with that much of it out of the water.
 
I agree with most of the comments here, and as burntrubber stated, fill the tank up, and I would also lose the pleco.
IMO the 2 Oscars and the JD are already maxing out that tank, and then some.
 
I will just add when you clean your substrate do not remove it and clean completely.
You should be using a gravel vacuum to remove the gunk and waste while removing water.
If you have basically scrubbed everything clean you will cause the nitrogen cycle that was mentioned earlier to crash, resulting in ammonia spike which can be deadly to the fish.
 
Your filter has very little discharge. Raising the water level will help that but you are going to want to upgrade filtration. My guess is if its stinking up the entire room you have uneaten wet food somewhere above the water level. Probably the rim.
Your heaters have me bothered a bit. The exposed glass one on the left is on and theres too much of the glass exposed above the water level. You dont want that thing blowing. The fluval heater on the right doesnt appear to be on. When they are heating the screen lights blue, when at temp setpoint they light green, when too far below temp setpoint it is red.
 
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Your led light might be burned out on your fluval heater or maybe its just washed out in the picture but you will want to make sure it is cycling on and off. I have a shrimp that comes out of mine when its on. Good for when the idiot light goes out haha.

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Please do your research before you buy fish. I'm trying not to be too critical here but you are quite overstocked. I tend to be a lot more conservative with stocking than most other people, but these are cichlids, some of the smartest fish out there (particularly the oscars). They need a lot of enrichment and even though they are not too active, they need a lot of room to explore and swim around.

In particular, you will need to watch out for aggression. Your jack dempsey may be very aggressive to the oscars and the oscars will return the aggression. You need to cycle your tank, otherwise your fish will be gone within the month. If you don't know what that is you need to look it up (you should have already done so, if you followed fat homer's advice).

However, you did a lot of things right. The tank size is satisfactory if you get rid of your pleco (do not release it into the wild) and preferably the JD as well. You have a filter and a heater, and for beginners that is a huge tank and huge fish. Don't beat yourselves up too hard if you lose one or two (considering your tank is not cycled, this will almost certainly happen), you are beginners and this is why I don't recommend starting out with such an expensive investment. But this is what it is and you might as well make the best of it.

One more thing:
The moment ammonia or nitrITE (not nitrATE, very different things) rises above 1, dose the tank with seachem prime.
 
I would also look into some bio bacteria in a bottle, Tetra (Safe Start) makes a product, as does Seachem. (Stability)
 
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Getting a crash course on keeping water . Just keep testing and changing water as you cycle out your tank.
 
Nice looking Oscars. I would remove at least half the gravel permanently. Just a trap for waste. If it wasn’t cleaned properly to begin with is probably where the smell is coming from. That pleco is huge. Try to rehome if you can. Good luck and welcome to big fish keeping!
 
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