Werneri can be difficult bit I feel they should have their own tank or at
least share with soft-acid water loving fishes such as P. gertrudae and P,
tenellus. Try to give them the largest tank that you can and plenty of
small live food e.g. vinegar eels and micro worms as they are mid-water
plankton feeders.
Praecox are destined to be the "guppy" of Rainbowfish and seem to breed by
the thousand at a miniscule size in any reasonable water as long as they
don't get too much metabolic build-up.
Bruce Hansen
ANGFA
email: bhansen at ozemail.com.au
Don't miss the ANGFA web pages at -
http://www.ozemail.com.au/~fisher/angfa.htm