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Not a tank, it's for our scrubbers. The Dow 795 sounded good, but it's not recommended for food, and I'm trying to stay with food-safe: https://www.pksupplies.com/dow-795-silicone-building-sealant-103-fluid-ounce-cartridge.html

That's why I'm looking for similar to GE1 number 312A, because it's slow set, and moldable/smoothable for a while.

What is the favorite silicone similar to the GE silicone 1 number 312a (black) ? 312a is getting hard to find.

One thing about alcohol... too much is not good. It will cause the silicone to not harden as much as it normally would.

It probably has a ISO9001 listing or similar, like having a UL listing it will cost much more.

If the LED's are submersible, then yes you could put them in a sump.

A haunted underwater dream cave could not be more fun

0 to 150ppm nitrate in 2 days is some sort of error.

I'll be there... in spirit.

Yes the guard almost looks natural, like in a nearby pond with some type of fill or drainage system.

If in a shed, you could just heat the shed and not worry about insulating the pond. Also there will be condensation inside the shed, so you may want to cover the pond to keep the moisture in.

Yay more ponds! If you don't always look at it, you could always make a clear cover for it, to keep all condensation inside. A motorized one would be neat.

Here are some upflow layout designs to give you ideas of what might fit your tank or ability to DIY better: Simple upflow screen: Attach to glass: Bubble remover: Attach to glass, with compartment: Attach to glass, small: Hang on back: Collector: Floating:

ASI Black 11oz tubes are usually strong adhesion, and quick, but last few months has had issues not curing hard. GE1 is consistent, but weak adhesion, and slow; very smoothable tho. Interestingly, the Biosphere reef system was run by Adey who invented the first algae scrubber in 1980.

I wouldn't worry about stagnation. Any particles that get back there will be consumed by microbes if your animals can't get to it first.

People often ask what they can do to speed up the filtering after they've added a scrubber, at least until there scrubber "catches up" and fixes thing. Here are some things to consider: Increase the lighting period in your display a few hours; this increases photosynthesis (filtering) of your...

Maybe geothermal can be used to get the free heat.

Here are some scrubber results I collected: "[Scrubber] is working incredible well. Went from constant algae outbreaks (3-4 per year), to no algae at all. 10 yr old 250 gal reef tank, started developing blooms at year 7. Nothing else worked, even breakdown and rebuilds." -- Joe Lopez "I recent...

Wow just read this. Any large advertiser like them has at least one ad agency that is well versed in the legal portion of all this. They probably let it slip by "on purpose".

Yes reading forums is probably the most fun there is. Besides reading scientific studies.