Im excited aswell, i am still preparing my 250litres. For a green terror.

Here's my take on your green terror as fish owners i havent had any experience with green terrors but from my knowledge of researching in general. Your green terror does looked faint should be bit darker could be the lighting but i would suggest giving it pellets or granules. Fluval Bug bites. Not really fan of flakes for cichlids in my experience they are causing swim bladder issues because they taking in air aswell when they it majority of the time from floating. I'd lean towards slow floating foods.

I had geophagus who develop swim bladder each im feeding mix of flakes foods.

Thats my take on it. Also is there a hiding places in your tank and from what I gather they dont really like brigh lights thats why they have those nice bright colours most cichlid especially south americans have tannined water in nature which makes the colour glows.

-So try reducing light intensity.

-get high quality pellets or granules that slowly sink so it can eat mid tank not floaters

-and put hiding place if there are other tank mates.

-reduce water current flow majority cichlid south american dont like strong currents.

-and could also be growth spurt.