when germination occurs do you remove the some off that one plant or all?

I usually plant 2-3 seeds in each cup to ensure a plant germinates in every cup. After growing for a while, I choose the most promising looking sprout and prune the rest out.

Are sponges supposed to touch the water? Mine are suspended above the water even at max water level.

Yes the sponge inserted within the basket is submerged in the water mix so that the plants can get nutrients.

My apologies do to autocorrect my question wasn't clear. I was asking once germination occurs do you remove the dome on that one plant or all of them?

Consider the purpose of the dome - it is to retain moisture while the seeds are germinating and to ensure seeds / sprouts do not dry out during this process. Once a sprout gets to the point that that dome is a hindrance, you will want to remove it. Apply this policy individually to each plug. We may find that for each plug, the sprout(s) will begin to crowd the dome after the first true leaves appear. HTH.

Manufacturer	URUQ
Model Number	HP-GC201
Package Dimensions	39.1 x 25.7 x 19.5 cm
Material	プラスチック
Color	A-ブラック 12ポッド
Package Weight	2.42 Kilograms
Batteries Required	No
Batteries Included	No
Brand Name	URUQ
Capacity	6.5 Liters

水耕栽培システム 屋内庭園:URUQ 12カプセル 屋内ガーデニングシステム LEDグローライト付き 高さ調節可能な植物発芽キット 静かなスマートポンプ 水耕栽培ポット 新鮮な収穫 ブラック

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水耕栽培システム屋内庭園:URUQ 12カプセル屋内ガーデニングシステム LEDグローライト付き高さ調節可能な植物発芽キット静かなスマートポンプ水耕栽培ポット新鮮な収穫ブラック