cory cats help!
ok well i have 3 speckled corys: cory frank and bob in thisbe's (female betta) 20 gal long its been up maybe a month and a half maybe longer now
i have a pennplax 30 gph filter
a jebo sponge filter (used as a co2 reactor for my diy co2 system)
a pennplax adjustable 100w heater keeps water @ almos 80 degrees
i add about 2 tsp of aquarium salt (for my gobies)
and some live plants
i want to cycle the tank later but have no money for a mater test kit a.t.m (also if anyone has any info on all i need on cycling please send it my way =) my fish will love you for it =P) so i just take some of my water every now and then to petco to mooch off of them for free water tests =P atleast to make sure the waters safe
so heres my problem about a week ago i changed a gallon of the water and then one of my cories started acting weird and just stopped moving around so i moved him to a seperate tank in case of sickness (2gal) and added a bit of aquarium salt he seemed to get a lil better over 2 days but still barely any movement then last night he was breathing heavily and had a small 'spaz attack' and this morning he was dead
i went to exchange him and have my water tested and they said everythings fine but my amonia was a little high so i vacumed my gravel and changed about 3 gallons and now another cory is acting as the other did (not moving and slightly on his side) but the other two are fine and wiggling all over the tank the only diferance in what i do with my water is i switched from amquel conditioner to seachem prime since i read such good reviews on it
what do you guys think is going wrong?
these are my first corys i've ever had so im not too familiar on how they are though i did read up a bit before buying
Sounds like ammonia poisoning is the culprit. I'd get yourself a liquid test kit (I like the API Freshwater Master Test Kit) so that you can monitor ammonia, nitrite, nitrate and pH. Having your own test kit is much better than simply relying on stores to test for you (especially when they say things like, "your water is fine; your ammonia is a little high" - there's no such thing as "fine" water with any sort of ammonia reading). I would recommend doing a 50% water change on your tank as soon as possible, using a good water conditioner that detoxifies ammonia and nitrite (Prime does this and I'm a big fan).
Your tank is already cycling as we speak, so you don't have to "start" cycling it at some point. Have a read over this article:
What kind of gobies do you have? Corydoras catfish and bettas are both sensitive to salt in their water. Some gobies do need brackish water, though, so it might be best to keep these fish in two different tanks.
I second iamntbatman's advice. I am a bit puzzled why changing one gallon in a 20g tank should have caused such a reaction. I wonder if there is not more to this.
Corydoras are sensitive to salt, any chemicals and medications, or significant fluctuations/changes in water parameters and conditions (quality). They like stability and well-established tanks. Two tsp of salt in a 20g doesn't seem like much, but it can build up if you keep adding it; and you don't indicate how much salt you used when you moved the cory to quarantine. It may have been too much.
Might reduce amount of food and frequency of feedings until tank has cycled and not disturb the filter until tank has cycled. If you don't overfeed,filter should stay fairl clean and not become clooged and it will also help keep ammonia levels manageable.
DIY Co2 could be affecting the pH of the water. And water used for water changes may have quite different pH. Might also be something to consider.
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