Corydoras are bottom dwellers, in which the bottom of the tank gets less oxygen, with the already high amount of fish you are going to have the oxygen levels will be quite low down there. Sure you can try to raise the oxygen by making the surface more turbulent but then the gourami wont be able to succesfully make a bubble nest with all the strong current
Second corydoras barbels are sensitive to water conditions, nitrate being one of them, you will need to keep the nitrates below 20 for them to be happy as a high nitrate level will damage there barbels. With a largely stocked tank the nitrate levels will be high and unless you are willing to do many water changes, there barbels will deteriorate.
Cories in a small tank, might work if you are willing to do a lot of stuff on it, it might work, corydoras in a small tank with other fish that overstocks the tank a bit, no.
I have cories in a 10 gallon tank, 2 C. Trilineatus (julii), 1 panda and 1 albino. They are more than happy and their barbells are extremely long and healthy. Nitrate levels are at least 20ppm as I dose 30ppm weekly for my plants. I also run an airstone 24/7 for oxygen even with my plants.
The stocking does seem like it could be too much but with adequate filtration and good gravel vac once a week they should be fine. What kind of filter do you have? That will be a better determiner if your plans will work. If the filter can't keep up then the stocking levels may be a problem. Gouramis can also be aggressive so you might want to watch for fin nipping.
it says you can have 1 - 2litres for each cm of fish, but says to keep to small fish and gives stocking guides. this is all i know about my filter. i replace filter bits and bobs correctly and the tank is siphoned a good 30l each week.
thanks for all the help. im not arguing with anyone im just saying what i have researched. thanks
that filter can deffinatly not be able to stock well, infact you probably wont be able to stock 10 cm of fish properly, why? Since there is no bio-filter, the filter is just a bag of activated carbon, it will provide mechanical and chemical but wont do anything biological, you need another filter. Either get or make a sponge filter or get another HOB filter. Get a penguin or emperor or aquaclear HOB filter for the bio-filtration.
thanks, i think i will keep it on its own and if i see that my tank isnt haddling it i will buy another. i dont have much money most of the time (only 14) so i can just buy a filter. but if things even look like they are going down hill i will be done to [email protected] in a flash.
well if you want to save money, get the Hagen Aqua clear filters, if you have a bit more to spend then get the Penguin bio-wheel filter. Both have good reviews and both have a part in them that you dont change, just that the penguin has a bit better bio-filtration.
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