Found my answer. Nvm.

Hello, how can I get more astral bricks? I want to have more pet rooms but socialization isn't giving me any, and summoning used to give some but I just did two summonings with 100 materia and essence each and didn't get a single astral brick ): I'm stuck at 72 out of 125 to build new rooms for the new eggs

@Foxfire Astral bricks are the lowest-rarity summonable item, so if you want to get more bricks you should do a low-rarity summon (avoid putting in gleaming essence or the essences of the four Higher Aspects).

Thanks that worked!