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We have a 30 gallon freshwater tank that is been set up and running for about 10 years without issues. Recently we've noticed a series of brown spots appearing randomly on the glass on various sides of the tank. They probably average about the size of a quarter although they are not round and...

It's a standard 29 tall tank, 30" long, 12" front to back and 18" deep.  The fish population is: 1 twig catfish that is full-grown, 1 full-grown bristle nose pleco, 4 neon tetras, 4 balloon belly mollies, 3 clouds, 1 Emerald cory 3", 2 peppered corys 1" and 1 Julii Cory 1".  I used be able to...

The filter pad in our Fluval C-4 filter is constantly getting plugged with a black gooey buildup.  We put a new pad in 2 days ago and it's already plugged tonight.  We are you running this on a 29 gallon freshwater tank with a normal population of fish, gravel bottom and artificial plants.  All...

  Mainly because the Emperor has a bio wheel whichever she will not fit inside of the C4.

I've been running an Emperor 280 filter on my 30 gallon tank and am in the process of switching over to a Fluval C4 to allow me to have more flexibility for media etc.  I've been running them both in tandem for about a week.  How long do I need to continue to do this to ensure that the new...

What foods do they prefer?  I know their first choice is obviously algae but between him and or bristlenose algae doesn't have much of a chance in our 30 gallon tank.  He doesn't seem to be very interested in shrimp pellets, algae wafers, or anything else we've tried so far.  Maybe he's not...

I also mix and match filter elements with good results.  There is nothing that says you can only use was provided with a filter.  Especially in the case of specialty pouches of different filter media's it's done very often.