Feb 22, 2026 #1 ZzyzxRiver Well-Known Member View Badges R2R App User My Tank Thread Joined Jun 11, 2024 Messages 975 Reaction score 1,157 Location Orange County, CA Rating - 0% 0 0 0 A milky white structure with a single hole in it is growing in a gap in the structure my GSP is on. What on earth could that be??
A milky white structure with a single hole in it is growing in a gap in the structure my GSP is on. What on earth could that be??
Feb 22, 2026 #2 logibear Well-Known Member View Badges Ultimate Member R2R App User Secret Santa Rocky Mountain Reefers Joined Jan 2, 2024 Messages 604 Reaction score 1,334 Location Denver Rating - 0% 0 0 0 Looks like sponge to me