care can be different for even just one species because of all the variants.
which species in particular are you looking for?
the ones you are most likely to find are erythrinus erythrinus and hoplias malabaricus.
i'll list information for just these two for now unless you are able to find the rarer species such as hoplerythrinus,lacerdae,aimara etc.
erythrinus erythrinus (red wolf) and erythrinus sp. peru:
get to 8 inches and rarely slightly larger.
water not very important,just keep it clean and stable.
they are less hardy than the hoplias wolves.
eat basically anything.
ive gotten them onto pellets with ease.
grow pretty slow.
fastest ive heard was 0.5 inches per month.
all of mine grew at about an inch per 3 months up til 6 inches then slowed down.
most are not aggressive to any fish that cant fit in its mouth or looks like another wolf fish.
hoplias malabaricus (common wolf):
generally,get to about 20 inches.some variants get smaller,some bigger.
water not important.
just keep it clean and stable.
very hardy fish.
feed basically anything.
ive gotten them onto algae pellets.
many will tell you not to keep them with any other fish.
but i personally dont agree.
they can definitely be kept with other fish IF they are raised with other fish from the start.
then they wont think the whole tank is theirs.
i have kept mulitples together with other fish without problems on many occasions.
they were always pussy cats in my tank and didnt fend for themselves when pushed around.
they just move away.
i know sevendreamz is gonna say something about this.