Guppies Dying, Like, In The Weirdest Manner.

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P0nyL0rd

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I have a 12L guppy tank, with a couple other live bearers like black mollies and a hifin lyretail swordtail. It is a new tank.

I let it have a fishless cycle for about a week with well established filter medium from my other tank's filter placed in the new tank's HOB filter. I didn't do readings, I'm poor and test kits are really expensive here :<

Well, I placed some of my grown up fry into the tank. They were happy to upgrade from a 1L to 12L! They are very small even though they are 7 months old, I think inbreeding as the cause. They lived fine in my tank! Then came a pair of black mollies, a male and hifin lyretail female, and my hifin lyretail swordtail, they seemed to think the tank rather spiffy, they settled in right away. The tank was about a month old then.

I bought 10 more guppies from a LFS, and all hell broke loose. They were quarantined for 10 days, all fine, and when i did the usual introduction into the new tank, they seemed fine.

Next day, body count 1.

I didn't really know what was going on, looked like they were suffering from fungal fin rot, so I put some medication in.

Next day, body count 2. 50% water change

Continued with the medication, other fish seemed fine, one gave birth to fry, put them in a floating fry trap.

Next day body count 4 50% water change

Stopped medication, one of my original batch died.

Fast forward to today. I am left with 1 of the bought guppies after 2 weeks, and he isn't don't very well.. Red fin becoming transparent.. listless and all that. What could be happening with my tank? What's wrong with it that they couldn't take it? The other fish are absolutely fine with it, and now some are dying of whatever killed the store bought guppies, bah, how frustrating.

I'm sad cos these guppies I raised since they were itty bitty, the tank has aquarium salt in it. What could be going on? :<
 
12L is far too small for that many fish, as well as far too many were added at a time. Sounds like you really need a test kit as the ammonia is probably quite high.

If I understand correctly and you were keeping your grown fry in 1-2L containers beforehand (or did I misread that?), then they very likely have stunted growth.
 
IMO, 12L is way too small for those fish. I would only put shrimp in that or if I was to push it, a betta in such a size tank.

If you added 10 guppies to a 12L, it probably got an ammonia spike.

My advice would be to buy a bigger tank, or re-stock that tank.
 
You are grossly overstocked P0nyL0rd. Stop buying fish and start doing large daily water changes instead. The betta you have and this tank will both do better that way (yea, I spotted your other thread).
 

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