Hi Wish,
Depends on who you ask. I've tried sponges Halichondria sps. in a seahorse tank but did not have much success. As you probably know most cannot tolerate any exposure to air, even briefly. They are filter feeders and demand bacteria and phytoplankton to survive. Some have endosymbionts to help provide nutrition in the same fashion as corals. They need good flow and tank placement is critical.
In general the colorful ones tend to lose that color over time and many tank critters will nip at them giving a rag-tag appearance over time. Some also release toxins that can kill nearby corals. I would suggest you avoid them unless your really know what your are doing.
Depends on who you ask. I've tried sponges Halichondria sps. in a seahorse tank but did not have much success. As you probably know most cannot tolerate any exposure to air, even briefly. They are filter feeders and demand bacteria and phytoplankton to survive. Some have endosymbionts to help provide nutrition in the same fashion as corals. They need good flow and tank placement is critical.
In general the colorful ones tend to lose that color over time and many tank critters will nip at them giving a rag-tag appearance over time. Some also release toxins that can kill nearby corals. I would suggest you avoid them unless your really know what your are doing.