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Re: Fishless cycle is just not working, guidance needed....

Subject: Re: Fishless cycle is just not working, guidance needed....
by Fishlady on 2019/11/18 11:42:47

Hard water isn't suitable for cardinals or for most tetras and they will be under permanent osmotic stress in alkaline conditions, leading to increased susceptibility to disease, liver and kidney problems and a shorter lifespan. However, there are a few tetras that can deal with harder water so you may want to consider these:

X-ray tetra - Pristella maxillaris
Congo tetra - Phenamogrammus interruptus
Black widow tetra - Gymnocorymbus ternetzi
False penguin tetra - Thayeria boehlkei
Red - eye tetra - Moenkhausia sanctaefilomenae
Glass bloodfin tetra - Prionobrama filigera
Lemon tetra - Hyphessobrycon pulchripinnis

Regarding nitrate remover: it shouldn't be necessary to use this kind of product. With the right stock level and a weekly 25-30% water change nitrate should be well-controlled.