Eggcrate is more commonly known as Light Diffuser outside of the marine aquaria hobby. It's intended use is in fluorescent lighting fittings in the ceilings of office buildings. Therefore, can be purchased from electrical wholesalers and / or larger hardware stores.
The most common and cheapest colour available is white. It can also be found in black (and even silver), but this is more expensive and difficult to find a source.
- Barrier to stop fish going over an overflow.
- Barrier over the top of a tank to stop fish jumping out or something (e.g. cat) getting in.
- Platform to stack liverock on.
Internal overflow with eggcrate barrier