I have two new hatchlings in the house too. I knew what to expect as I've raised 2 other pairs of hatchling bearded dragons in the past.
My two are only 10g and 15g , so only at most 2 months old , the breeder suggested housing together and playing it by ear for now . I was ready to separate the pair from the getgo in two 120L rearing tubs.
So they are housed together in a 120L converted tub temporarily , I expect to separate the pair in a month or two.
This is the current set up :
Light & UV & heat sources in rearing tank:
26W UVB200 in NanoHood
35W Neodymium Daylight Lamp (gives 38 - 40 degC at highest basking spot , using because I have some in my stash , they are very compact (space is an issue under the lid) and they give the right basking spot temperature for my setup).
7W heatslab sandwiched between tiles controlled by a thermostat set to hold 35 degC under hide.
My current tactics are :
> I left 40 bsfl in an excape proof porcelain feeding dish over night.
> I count the bsfl when I am ready to give them a feed of crickets (about lunchtime) , only a few crickets released at a time.
> the bsfl stay in the rearing tub in a feeding dish for the evening meal
> the salad goes in after the crickets have been eaten ( if they nibble on the greens that's fine, if they don't at such a young age - I am not going worry, breeder said they were eating salad everyday already), I want them to know the green and orange stuff is there and is a food
> I remove the salad left when I go to bed , but if I think there may be a rogue cricket or two or three in the tank it's left there overnight ( I'd rather the crickets eat the left over salad than bite my babies).
From tonight (this is night #3) I'm removing the bsfl overnight and only leaving the salad.
I'm expecting they will be eating 8 - 10 small (1/4 size) crickets per day each (or the equivalent) + a nibble on the salad each day , likely by next weekend.
My two had 4 small crickets (25 d/old = 1/4 size) each + 4 bsfl (not sure who ate them) this morning & and there was evidence the salad had been raided too.