Filter making craters in substrate - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 07-04-2012, 05:19 AM Thread Starter
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Filter making craters in substrate

I just set up a new 20L (thanks petco 1$/gallon) with ADA Amazonia New. Got the wood & substrate in and after the tank cleared I started my filter, but it is making a crater infront of it. The tank is a cheap petco 400gph hob filter, there is no settings on it that i can see to change the water flow. Should I just downgrade my filter or will it eventually stop? I'm planning on a dwarf hairgrass carpet through the whole tank should I just start planting and the roots will solidify the substrate?
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post #2 of 9 (permalink) Old 07-04-2012, 05:35 AM
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You can try adjusting the water level in the tank...higher water level might send the water out more horizontally...
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post #3 of 9 (permalink) Old 07-04-2012, 05:37 AM Thread Starter
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water is already almost to the top. Level is right above the bottom of the black rim.
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post #4 of 9 (permalink) Old 07-04-2012, 05:37 AM
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Is the water level lower then the output edge the drop can cuase the craters. You can put filter floss in the output end to slow down the flow.
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post #5 of 9 (permalink) Old 07-04-2012, 06:12 AM
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Be careful with blocking the output on a HOB filter. If it's pumping in more water than it can dispense, it'll eventually overflow out the back, onto the floor. It's not the same as a canister, where input is dependent on output...
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post #6 of 9 (permalink) Old 07-04-2012, 09:16 AM
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I have an AC50 on my 20L that I've baffled using a plastic bottle. Just google hob filter baffle and you'll find multiple posts describing how to do it. The plastic bottle pushes the current out to the sides instead of allowing it to dig into the substrate.

Depending on how strong the flow is, you may be able to rubberband a piece of filter sponge to the front instead. I use that on my AC20 in my 5g betta tank...I cut an aquaclear sponge in half longways so that it was half as thick as normal and just rubberband it to the front. I keep the AC20 running full blast, but the water runs through the sponge and causes almost no current in the tank.
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post #7 of 9 (permalink) Old 07-04-2012, 09:21 AM
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Either put a spong on the intake or put a stiif plant bunch, rock or log of wood in front of the overflow of the filter.

On one hang on filter, i moved the bio mesh from inside the box to onto the spill out.
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post #8 of 9 (permalink) Old 07-04-2012, 03:07 PM
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I've used plastic as a baffle to calm strong flow from HOB filters. All I did was use some strong black plastic (cut from TV dinner tray!) and clip it so it was directly in the line of the outflow. That redirected the outflow to the back and sides. You can cut groves or holes in it to allow some water to move forward. The main thing is to obstruct the water flow direction without obstructing the water output.

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post #9 of 9 (permalink) Old 07-04-2012, 05:24 PM
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I have placed hardscape items in the path where the strongest water flow hits the substrate, and it takes a little bit of arranging, but it does work.

I have used a strip of plastic on the outlet (with electrical tape) to divert the flow to a more horizontal angle. In a narrow tank that simply moved the divot to right at the front. So I put a rock there.
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