its suitable for 90 gallons tank?

Should be fine. The intake might not reach to the bottom, but you shouldn't be running your water level that low anyway. It reaches to the substrate level on my 20gal long tank.

Can you say when this 20mm version would be back in stock?

It is back in stock.. i have ordered couple of them

Is there a set, lily pipe inflow/outflow with surface skimmer? 20mm for 3/4 ID tubing?

Yes, i was able to find inlet/outlet with Skimmer but only up to 16mm.. And yes, 20mm is for 3/4" ID tubing

For an FX4 - the input slits look like too few slits for decent inflow. is the input too restrictive? Cut more slots?

It works well with my fx4 haven’t noticed any drop in flow. I have thought about cutting out the bottom sanding and adding a screen mesh but not necessary

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Glass Lily Pipe Inflow Outflow Set 20mm for 3/4" ID (19/25mm) Tubing

Product ID: 342911772

💧20mm diameter for optimal flow

🔬Hand-blown borosilicate glass

⚙️Adjustable outflow for perfect aeration

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KD 53.99

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Description

💧 Elevate your aquarium’s flow and style with precision glass artistry

CUSTOMIZABLE OUTFLOW - Fine-tune water flow to eliminate surface film & optimize CO2 retention
UNIVERSAL COMPATIBILITY - Fits 3/4" ID tubing, perfect for Eheim, Tetra, and more
WIDER WATER INTAKE SLITS - Maximize filtration efficiency with broader water draw
ELEGANT GLASS TRANSPARENCY - Showcase your aquarium with sleek, crystal-clear curves
DURABLE BOROSILICATE CRAFTSMANSHIP - Laboratory-grade glass ensures strength and long-lasting clarity

The Glass Lily Pipe Inflow Outflow Set features a 20mm diameter hand-blown borosilicate glass design with upgraded wider intake slits for enhanced filtration and an adjustable outflow pipe to optimize water circulation, CO2 retention, and oxygenation. Compatible with standard 3/4" ID tubing, it combines durability, functionality, and elegant aesthetics for a premium aquarium experience.

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