I don't think it matters too much, I have a lot of current in my tank, and my aro does just fine. I acutally find him swimming against the power head a lot of the time.
Tell us more about your set up, i.e. tank size tank mates etc. What kind of aros. Are you planning on keeping thme both together? As I understand it to keep multiple aros you should have atleast 5 and that will tank a lot of tank space.
This is Norway and her everything is expensive. Payed 100$ for two silver arowanas.
They dont have their egg sak on. And they are a little bigger then i said. Between 6-9cm. One is bigger than the other. Today they go with:
-6 siver dollars
-a couple of hundred flag tetra fry. (food for them)
-a 10-12 cm senegal
-1 sailfin pleco also 10-12 cmm
The tank is 540 liter. I know it is going to bee to small when the arroes grow.
I my 200 liter tank i have:
-1 small (5-6 cm) polypterus delhezi
-1 black ghost
-1spottet clarias (5-7 cm) probably getting rid of this one. It is crazy
-1 small sailfin pleco 6-7cm
-and about 20-30 flag tetra fry