Can the cap come off to add more ferrofluid later?

I'm not sure if the cap is supposed to be removable, but it definitely is.

Is this the stuff you use for replacement of tweeter diaframs

This is not the same ferrofluid for speakers. Don't use it for that if you care about your speakers.

Will this one dance to music like the ferrofluid speakers I see?

It will react to the magnetic field of a speaker if it's strong enough. There is nothing special about the other product other than it has built in speakers.

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Inspired Designs Blue Colored Ferrofluid in a Bottle Display - Magnetic Ferrofluid Decorative Magnet - Science Kit - 1 Count - Glass Bottle

Inspired Designs Blue Colored Ferrofluid in a Bottle Display - Magnetic Ferrofluid Decorative Magnet - Science Kit - 1 Count - Glass Bottle

Product ID: 83879487

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Details

Size
Small
Color
Blue
Material
Glass
Brand
Inspired
Shape
Rectangular
Item Weight
3.2 ounces

🌟Unique display

📏Compact size

🔵Vibrant blue hue

Description

💧 Dive into the mesmerizing world of ferrofluid!

COMPACT CHIC - Perfectly sized to fit any desk or shelf without overwhelming your space.
TIMELESS APPEAL - A modern piece that complements both professional and personal environments.
ART MEETS SCIENCE - A stunning blend of art and physics that sparks conversation.
TRANSFORM YOUR SPACE - Elevate your decor with a mesmerizing blue ferrofluid display.
QUALITY CRAFTSMANSHIP - Handcrafted glass design ensures durability and elegance.

This small, blue ferrofluid display in a glass bottle is a unique decorative piece that combines art and science, perfect for adding a touch of modern elegance to any space.

Specifications

Size	Small
Color	Blue
Material	Glass
Brand	Inspired Designs
Shape	Rectangular
Item Weight	3.2 ounces
Manufacturer	Inspired Designs
Unit Count	1 Count
UPC	762470535856
Number of Pieces	1
Package Dimensions	6.46 x 2.05 x 2.05 inches
ASIN	B07HB7T9C5
Item model number	43502-8701
Is Discontinued By Manufacturer	No
Date First Available	September 13, 2018