Hello everyone! I have a question regarding the photosynthesis rate in algae, even better if you know for pondweed. Specifically, does anyone have data or insights on the average photosynthesis rate (measured in µmol O₂/cm²s) across different wavelengths of light (400-700 nm)? Additionally, if anyone knows the general average photosynthesis rate for pondweed or algae, that information would also be very helpful. Thank you!

This black algae has been growing on the sand in my tank. I looked at a sample under a microscope and see these small round cells that clump together, can anyone ID? I’d like to know what they are so I can figure out how to get rid of them. Also just curious what these large brown things are. More images in comments. Thanks

Can succulent plant feed help grow algae?

We have a small wildlife pond with some aquatic plants in our front garden. Recently we've had some algae growing and was wondering what type it was.

The brown algae was what I was most interested in. I'm guessing it's beneficial and benign but thought I would find out. Covers about 1/3 of surface, and we'll be taking efforts to stop it growing over too fast.

I found this green like matted filamentous substance that produces a lot of bubbles I’ve never seen before in my hornwort grow out tub and it’s outcompeting my hornwort and enveloping it, I took some out and separated in a smaller container just see better what it is and it’s light green and a bit yellowish, and wondering if it’s Cyanobacteria because it’s spooky how fast it’s growing

I posted previously but my picture sucked so i'm back with a ever so slightly better picture.

in short, these orange globs have been forming in the indoor pool i work at for a year now. they form almost entirely in and around the pool skimmers (the holes around the pool edge that let suck water into the filter) we drained the pool, acid washed the concrete, and replaced the entire filter and it's back.

I don't know if this is an algae, fungi or mold so if you recognize or have any suggestions as to what it may be, please lmk

https://preview.redd.it/zo4q4yk0lixd1.jpg?width=2080&format=pjpg&auto=webp&s=3bf9892b33d385f6f3fd4ab69b44c9824320af0e

Found in an active sludge sample.

My Asparagopsis taxiformis culture is balling up and dying off after moving it from a 250 mL flask to a 500 mL flask. I’ve tried increasing light levels, reducing movement caused by maybe excess bubbling, and now I’ve moved it back into a 250 mL flask… any suggestions to save it?

Hi folks! I sample a stream (five weeks/quarter) that is impaired for fecal coliform and the results for the first week of this cycle came back really high for one of our sites. We noticed what I presume to be algae that we hadn’t seen before. This week the number is a little lower, but still high compared to our other sites. I’ve included pictures of the algae. Any help with identification would be extremely helpful to get a better idea of what could of caused this. This is in the piedmont of North Carolina.

I work at an indoor pool, bromine chemicals only, sand filter. For the past year i've been plagued with this orange algae? at least i assume it's algae. it grows primarily out of the skimmer entrances (the holes on the poolside that let in water) and it grows down the wall in front of the skimmer entrances. from what i can tell, it is not yellow algae. it is very orange in color and it does not grow on the floor at all, only in gooey clumps on the high part of the pool wall. it forms in almost perfect circle of goop, and when it's touched it falls apart into pieces like peter parker in infinity wars. please if you know who this algae is let me know. we have drained and acid washed the entire pool already and it's BACK. we also replaced the filter and the sand in it. i was worried maybe it was residue from bodily oils/soaps but that tends to be white and all the way around the pool, not just the skimmers.

any information or theories are welcome thank

Hi so I have a cyanobacteria bloom in my freshwater tank so I tried removing some and got some on clothes and cloths. So I threw the dirty laundry in the washing machine and washed it with hot water and a lot of laundry soap. It still smells. How can I clean it so the clothes are safe ? Thanks !!!

Hi! Perhaps this is a dumb question, but I've been growing Spirulina in a small tank for a few weeks and it looks like the water is evaporating. Are there any special notes you guys have about adding water to the growing Culture to top it up?

https://preview.redd.it/8m3avxf5divd1.jpg?width=3024&format=pjpg&auto=webp&s=8563d91039db8602f30730b12a90653e923b141a

I'm growing Spirulina in my studio and it's a very small tank, but Im curious about how much Carbon Dioxide/Particulate is in my room at any given moment and how much Oxygen is my growing algae producing. Does anyone know a simple way to measure that?

Hey y'all,

I’m currently based in Berlin and looking to dive into the algae biofuel industry, specifically by building a subscription-based vertical farming service that helps companies scale their biofuel production. Instead of producing biofuels myself, my goal is to lease vertical farming systems to biofuel companies, providing them with the infrastructure they need to lower their feedstock costs (which I know is a huge pain point).

I’m at the early stages and want to get some advice on a few key areas:

1.	Building the Team: What specialists should I hire? I’m thinking bioengineers, vertical farming experts, and software developers to manage the subscription model. Am I missing anyone crucial?
2.	Funding: I’m researching grants like Horizon Europe, but has anyone had experience securing similar grants for biofuels or sustainability projects? Any tips for success or specific grants I should be looking at?
3.	Technology: For those familiar with algae cultivation or vertical farming, what’s the current best tech for large-scale algae production? How feasible is this approach for scaling biofuel production?
4.	Market Validation: If you’ve worked in the biofuels space or helped businesses scale, how do you ensure a vertical farming solution like this would be in high demand? Are there specific sectors (e.g., transportation, aviation) that are most likely to benefit?
5.	Challenges: For those who’ve been in renewable energy startups or biofuel production, what are the biggest hurdles I should prepare for (both regulatory and operational)?

Any advice from entrepreneurs, algae biofuel specialists, or anyone with experience in vertical farming or renewable energy would be much appreciated as it feels pretty daunting but I'm sick of sitting on the sidelines.

Thanks so much!

Can anyone help me identify the black/brown stringy algae (assuming it’s even algae) that’s covering this rock at a jetty in NC?

Sorry I can’t get a close up pic. :(

We found globs of this gelatinous pinkish substance by our local pond. Google lenses said it was Hildenbrandia rivularis. Does anyone know for sure?

Wasn't here a few weeks ago now it's all over this part of the steam.

From a lab practice in college :) I was told this is a red algae