Crayfish need air?

duanes

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Isla Taboga Panama via Milwaukee
A pH of 7.8 is usually an indicator that you have sufficient calcium in your water for Crays, although the best way to check, is to measure alkalinity, (high is good 80-100, low 40 or below my be lacking) this also means not letting pH and alkalinity drop much in between regular water changes.
Adding some baking soda with a water change will help boost alkalinity.
If pH and alkalinity drop more than a couple points between water changes, it means calcium is being used up buffering the tanks metabolism by products, and more water changes may be in order to maintain that calcium.
I keep an endemic vampire crayfish with my Andinoacara, and though it is a filter feeder, it will occasionally try to grab a cichlid, but they easily are able to shake off, don't know that a discus would have that ability before becoming injured.
I tried keeping more than 1 cray, but they fought, and when one was injured, the cichlids would swoop in as a pack, and finish it off, tearing it to bits.
These Crays were at least as big, if not larger than the fish themselves, one is bottom toward left hand side below.
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They are called vampires because of the two white filter appendages that look like teeth, but aren't.
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jacobfata

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I think he should be fine LOL. I’m working turned about the discus LOL.
 
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