Update on those AI lights with Noctua fans....they're still working great. I should have done it years ago. I did set the OEM round screen thing back on top of the fans, but only because I found that I end up with my fingers or hair or beard way too close to the blades.
Next, for the last few years I've been using a
this frag rack in my QT. It works really well, but the problem is that the snails and/or urchins get under it and flip it over. I usually keep it wedged between a few rocks, but they move those too.
Part of the problem is that this is a bare bottom tank, so it's easy for animals to get under it and the rack has no way of holding itself in place, even a good breeze off the wave maker can move it.
This is what I came up with:
www.printables.com
It goes in the tank with the flat side on the bottom and then you can set a rock on it to keep it in place.
If anyone prints this, it works perfectly as is. However, it's a tight fit for some plugs (variations in size, crud on them from being in the tank etc) that it wouldn't be a terrible idea to print them just a hair bigger.