Need Tinfoil Barb Help Expert

[Faythee]

I bought these 3 little, LOL, Tinfoils in Jan. for my 75 gal. tank with Severums. Every day they looked like they grew overnite ! My dilemma is figuring out whether thet are regular or Red Tails. I have been measuring them and the growth has finally seemed to come to a stand still at 5 inches over the past six weeks or so. I need to get another tank for them and am looking at a 55 gal., however if they are regular I'm not sure if that will even be big enough.

What do ya think ??

 

[Faythee]

Another

 

[ox5477]

Im pretty sure tin foils grow in comparable sizes to Balas (12-14") and need to be in shoals so a large tank is needed. I would say 90 to 125 would preferable as they are active swimmers as well and need space to swim and dart when startled.

Ox

 

[Faythee]

Yes I know. That is why I am hoping they are Red-Tail which only grow to 7"

I found this:
The Red-tail Tinfoil Barb can be confused with other members of its genus, especially the almost identical Tinfoil Barb Barbonymus schwanenfeldii. Though both these tinfoil barbs have a black marking on their dorsal fin only the Tinfoil Barb has red on this fin. The Red-tail Tinfoil Barb also is also missing black submarginal lines on the caudal fin.

Which is the caudal fin ?

 

[Davo86]

the caudal fin is the tail fin
is there a feint black line in the tail fin? if not they are Barbonymus altus, aka the smaller red-tail tinfoil as opposed to Barbonymus schwanenfeldii


true Tinfoil

 

[Faythee]

I don't really see black lines on the tail fin, but a bit grayinsh right along where that pic shows.

One of them appears to be getting some red on the dorsal.

Oh poo !