what filtration

Do a refugium sump so I can learn from your experience.
 
A sump is a good idea, and make it a fuge by adding some terrestrial plants (like spath) to filter out some nitrates, not a bad idea.

For such a large tank (assuming 300-350 gallons and not liters) I'd go with a large capacity Mag-Drive or similar pump, something that can crank out around 700-800gph at 4 feet of head. If you get one even bigger, you can have multiple outlets for seperate "trickles" and such. If you have a really nice flow rate, you can still keep slow-moving fish by using deep "ponds" and plenty of rock/driftwood in the lower pool.

Have the sump under the tank, and I'd use a ton of mechanical filtration since you may have a problem with dirt from any planting in the land part of the tank. Make the sump as big (in water capacity) as you can stand, dilution is the solution.
 
will use a 100+ gallon sump. I want fresh water stingrays. tank dimensions 96x48x18=360 gallons
 
is this your first tank? If so freshwater stingrays arent really the best thing to start on at all. Might be an expensive learning experience.

I currently have a P. reticulatus and a P. Leopoldi.

the other thing to remember is that they require PERFECT water conditions.

(0ppm amm, 0ppm nitrites, ~5ppm nitrates.)

if you DO decide to go with stingrays make sure the tank is WELL established (atleast 2 months with a fully cycled bio-filter reading 0ppm amm and nitrites.) and depending on what other tank mates (those who wont pick on the rays) make sure you do light planting to help with amm. and nitrite processing. Rays are fun but a lot of work as well just keep that in mind. and DEFINATELY research as much as humanly possible. I made the mistake on my first ray of not reading a TON before purchasing....Ive since learned my lesson.

BTW what type of rays were you considering about doing? IMHO if its your first ray then I would go with P. motoros. They are very hardy and not very picky eaters
 
Assuming that you know how to keep stingsrays, I would like to ask, if you are going to use a 100g sump, what method of filtration are you going to use?
Ime, a trickle filter on ist own unless it is big enough will not do the job. I would go for a combination of wet and dry filter material, using bioballs or something similar for the dry part and rings for the wet part. Is can I ask what your prefered filtration method is?
 
David,

How much impact and how is it manifested using the combo of pall rings and bio balls make compared to just bio balls. Are you suggesting ceramic rings such as Eheim Ehfimech?
 
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