Hey Guys,

I am really new to the whole nano thing (I’m sure you hear that a lot on this forum). Anyways, I recently have discovered new growth in my tank and I am a little concerned about it. I read the "please read me first" post on this forum before posting and I think one of them matches a sponge (see red arrow). However, the other growth (see blue arrow) doesn't look like the other one, and I was wondering what it could be?

Hopefully I've attached the photo correctly....

Thanks!

both are harmless the blue is a sponge forsure and red I think is one aswell either way both are harmless imo

Red circled one looks like a scypha sponge, aka "q-tip sponge" aka "pineapple sponge". Good filter feeders, they seem to like making the darker spots in our tanks their home, and may reproduce in profusion given the right conditions.

Dunno about the blue circled one, other than that it's a sponge as well. From the pic, looks to be an encrusting type of some sort.

+1 to both are sponges.

Thanks everybody that puts my fears at ease. I’ll probably leave them in if they are harmless, I think it add character to the tank