Encouraging Gbrs To Breed?

Hey guys! I've had this pair of GBRs for a few months now, and have been hoping that they would breed soon. They've been displaying breeding behaviours and everything, but I'm yet to get any eggs. Do any of you know any way to encourage them to breed?
They're in a 130L community tank also here's my male


Aaaand female

 

I've never bred them, but I've heard doing a water change with slightly colder water would help (its supposed to simulate how the rainy season would be)

 

In the wild, Rams breed in warm (30c+) of almost no measurable hardness, and a low pH.
But you don't have wild rams, and many tankbred, modified rams have adapted to slightly harder water. Ones that are closer to the natural fish may produce eggs, but they will not develop in harder water. You would want to stay at 50ppm or so for them.
Tannins can be a trigger - some oak leaves, peat filtration, mopanI wood or alder cones may trigger them. It's a trick I've used with other species from their region...

 

Live and frozen food. Good water and a live environment (stable). Mine just ate their eggs.

 

I often do water changes with cool water, but also add buckets of warm water so it's not too much of a shock for anyone. About a week ago now I did a change of probably more than 50%, majority cool water. Unfortunately it didn't trigger anything, thankyou though!

My pH sits at 6.5 usually and temperature is currently 27, and I'd prefer not to change either very much so that I don't stress out anyone else in the tank. Hardness I unfortunately can't measure. The driftwood I have in there seems to produce a decent amount of tannins, as the water is often quite 'tea' coloured. I don't think that any of my LFSs carry anything else I could use to add more unfortunately, and I also doubt a bit that it'd help.

I may go to the store today and get them some frozen food, anything in particular you recommend? Not sure where I could get live food though. All my conditions are good and stable
Thankyou everyone

 

Well I wasn't successful as my first attempt led to eaten eggs. However feeding live micro worms, frozen daphnia and rehydrate (in tank water) dried blood worms. Also the male appears to be eating baby snails or something (please focus on snails little buddy!).