Green Terror growth rate?

[GrantA94]

I feed my guys a mixture of foods: hikari gold, frozen bloodworm, daphnia, mysis shrimp, earthworms the occasional cricket. I think substrate and lighting affect colours though. I have a light golden coloured sand and a colour enhancing pink flourescent.

 

[BC in SK]

are you measuring the ENTIRE fish? cause its standard practise on the internet to only measure from the snout to the base of the tail.

I don't know where you get your info from, but the vast majority of people on the internet use total length and include the tail. The lengths of fish listed on profiles, and other sources are almost always total lengths. Fishbase for example, almost always has lengths listed as total length as many originate from fisherman, though it is always stated which type of measurement used.
Today, it's pretty much only scientists who use standard length (for many good reasons). Yes, in older aquarium literature, lengths of fishes were often listed as standard length, because the info or the author had roots in science. But you will seldom find standard length used today, other then for scientific purposes. Nothing standard practice.....quite the opposite, common practice like a fisherman to include the tail and use total length, as generally most people will conceive of the length of the fish as including the tail.

Anyways, fish don't have a set pattern for growth. Nothing too unbeleivable for a GT to grow rapidly over a couple months. IME, when a fish grows rapidly over a short period of time, they will have another peiod of time where growth is very minimal and very likely over a longer peiod of time will end up being the same or similar size to another specimen that did not grow so rapidly.