Hi,

this is Heiko and I wanted to underline what Larry (Apistomaster) said: Cardinals come from warmer temperatures than Neon Tetras. There is a difference of 2-3°C (lower in neon) normally in average. But it is also true, if you acclimatise Cardinal at say 25°C they probably will be ok, but live a little shorter life-span. P. simulans live in many places together with Cardinals, in the same habitat. Just found both again in one swampy pool in the upper Aracá last year. Black water and pH only 3.7, temperature was 28.5°C as it was shady, but in some parts up to 29.5°C.

All the best from a collector,

Heiko Bleher
www.aquapress-bleher.com