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This is a customer's HOG1 or 1x in saltwater... you can't tell which one because the Green Grabber rocks are the same on both; only the lights are different (X mean Xtra led's) and you can't see how many led's there are. Also, this is not packed green hair algae, and it is not black slime; it is somewhere in the middle... sort of a light green slime which still absorbs nutrients out of the water as long as you harvest it by brushing it out in your sink. Overall it's a compact little area to keep algae in, so less algae grows in your tank.
Attachment 7746
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Here's a customer's HOG1 or 1x in saltwater, although it's also fine with freshwater because is does not have strings. The growth should eventually spread to the sides after a few more cleanings.
This amount growth is about average for saltwater. New tanks will usually be much less, and more of a brownish slime; older tanks can get thick sometimes, and fill up the compartment (but not always).
Attachment 7853
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Update: Since the Fusion 700 air pump is no longer available, the Danner AP-4 is now recommended for most scrubbers, except the SURF4 or 4x which can use a Danner AP-8, and the SURF8 which needs a large single-outlet pump.
Note that all HOG and DROP models have 1 air inlet, therefore the 2 outlets of the Danner AP-4 pump can be combined into 1 with a "T" or "Y" fitting, and this will give you a lot of air which can still be reduced with the control knob. If you don't want to combine the outlets, then the smaller Danner AP-3 pump has only 1 outlet, but it also does not have a control knob.
https://www.dannermfg.com/supreme-ox...lume-air-pumps
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This looks like a HOG1 from high nutrient saltwater. After a few weekly brushings, the dark growth should start turning lighter, and the growth ring should fill in...
Attachment 8284
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New photos of HOG1 show black tubing. Also visible is the roughed up rim, which holds better to the glass.
Attachment 8368
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Two smaller HOG's instead of one larger one
Here is an example of two smaller scrubbers instead of one larger one; in this case it's two HOG1 scrubbers® on the wall of a saltwater sump. One obvious reason here is the lack of space, because a larger HOG1.3 or bigger might not fit into the compartments.
A second reason is continuous filtering: A scrubber filters more (absorbs more nutrients from the water) when it is full of growth, and thus when you clean/harvest it the filtering goes down for a few days until it grows back. But if you have a second scrubber that is not cleaned/harvested at the same time, this second scrubber continues filtering after the first one is cleaned. (All scrubbers must be cleaned/harvested though, to get the nutrients out).
A last reason is redundancy: if something happens to one of the scrubbers, you still have the other operating until you get the first one going again.
Attachment 8381
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This HOG1 or 1x is pulled out of a large saltwater sump. This size HOG is too small to do enough filtering by itself here, but it can help, and the growth can do all the herbivour feeding by just dropping it into the display for a day or so. Note the top 1 inch is flopped down; this is where the waterline was.
Attachment 8460
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Little space is needed for a HOG1 like this. This looks like a saltwater sump, so a HOG1 is too small for filtering, but it can grow food to feed. Only 1.5 inches (3 cm) of distance off the glass is needed.
The black shade cloth covers half the red light when new, so growth can get started without it being too bright (no brightness controller is used because they are not reliable)
Attachment 8471