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Old 02-27-2005, 11:47 PM   #1
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Prefilters on Maxi-Jet Powerhead questions

I have a couple of JBJ 235 GPH Powerheads in my 40 Gallon Breeder. I am getting nervous now that I have creatures, and see them cleaning the intakes....I am a little nervous that something could happen.

I am thinking about replacing them with a Maxi-Jet 600 and 900, and getting the Pre-Filters that are a option. I had a few questions:

1. Do adding pre-filters decrease the GPH that these pump give?

2. Do the pre-filters stick on the outside or on the inside of the Maxi-Jet intake

3. Are they hideous to look at?

I am trying to keep a 15 times turnover in the tank, and with the maxi 600 160 GHP, the 900 230 GHP, and the Rio 600 on my CPR BakPak giving me 200 GHP I am there. I want to add adequate flow without making a cyclone in the tank. My 2 X JBJ 235 have a small outlet hole, and creates perhaps too much flow in a narrow area.

I would be open to any other powerhead suggestions in an attempt to keep good flow...without jet propelling the occupants against the side of the aquarium



90 Gallon Fresh Water Planted w/ CO2:
7 Brilliant Rasbora, 6 Harlequin Rasboras, 3 Dwarf Neon Rainbows, 1 Red Tailed Shark, 2 American Flag Fish, 4 Skunk Botia Loaches

40 Gallon Breeder Salt Water: 4 inch DSB (2/3 Agaramax & 1/3 Sea Flor), Bak Pak 2R Skimmer w/ BBX, 2 x JBJ PHs, Coralife Lunar Aqualight (2x96w), 30lb Base Rock and 40lbs of Live Rock.
Inhabitants: Purple Firefish, Pygmy Angel, Lawmower Blenny, 2 Cleaner Shrimp, 1 Peppermint Shrimp, Pistol Shrimp(HH), 1 Emerald Crabs, 3 Porcelin Crabs(HH), varying amounts and varieties of hermit and snails.

3 Gallon Eclipse:
1 Goldfish (won free at a fair...cost $50 in equipment)
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Old 02-28-2005, 09:33 AM   #2
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Location: Savage, MN
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Do adding pre-filters decrease the GPH that these pump give?
I do not think so.
Do the pre-filters stick on the outside or on the inside of the Maxi-Jet intake
I believe it is the outside.
Are they hideous to look at?
Actually, Maxi-jets come with a "strainer" type cover for the intake. You can also buy a sponge looking thing to slip over this. The strainer does not look bad and does a good job of keeping things out. I have three maxi-jet 1200s in my reef and have never had a problem with things getting stuck in the PHs.

Some people are like slinkies...they serve no real purpose yet can still bring a smile to your face when you push them down the stairs!:p
Have a great day! Brian
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Old 02-28-2005, 11:14 AM   #3
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I just use the strainers. Even when my snails crawl over them, they can escape the suction.
But you would need to clean the strainers every week...they'll get lots of gunk stuck in the grates.
Former advisor and planted tank geek...life's moved on though.
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filter, filters, powerhead

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