Does it fit the trigger sustem sumps filter sock holder? The holes are oval

I have a ruby 36 by trigger and the cups were a little loose. So my husband cut the rings off a couple of old filter socks and put the rings around the top of the filter cup and it fits nice and snug now.

And what is the best filter media to put inside?

"Best" is 100% subjective based on the inhabitants of the tank and what you're doing. I use ChemiPure Elite or Blue (1 bag in as I've found two clogs it up).

Will this replace 2.75 filter socks on waterbox aio???

No - this is a 4" media cup designed to replace 4" filter socks. I have it on my 100.3 waterbox. I am not sure if RedSea makes a 2.75" media cup.

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Description

🧼 Elevate your reef’s clarity with effortless, pro-grade filtration!

PREMIUM BONUS - Includes a high-quality filter media bag, the same trusted type used in Red Sea Reef-Spec Carbon
UNIVERSAL FIT - Seamlessly fits all Red Sea Reefer sump holders and compatible with MAX systems
GENEROUS CAPACITY - Holds a full liter of filter media to maximize filtration efficiency
EFFORTLESS MAINTENANCE - Drop-in design for quick media swaps and hassle-free cleaning
VERSATILE MEDIA COMPATIBILITY - Supports filter pads, floss, carbon, GFO & biological media for tailored filtration

The Red Sea Reefer Filter Media Cup is a durable, easy-to-clean 4-inch replacement for standard filter socks, designed to hold up to 1 liter of various filter media. Compatible with all Red Sea Reefer sump holders and MAX systems, it offers versatile filtration options and includes a premium filter media bag for enhanced aquarium water quality.