I've heard mixed reviews on the berlins, but if it works for you and it's what you want to try go for it! A lot of people mod
skimmers to death
IMHO and I've seen too many times where someone has changed a pump to get more and gotten less. There's a reason manufacturers recommend and supply certain pumps... they designed the
skimmer to work as efficiently as possible with that pump. You may just want to find out what the rating on the RIO was and try to get closer to that mark or (shudder) pick up another one of the same rio's. You can also do gate valves and all kinds of modding tricks but given the cost of
skimmers it's best to let the design of the thing do the work and not play (unless you're into
DIY and willing to take the risk, then go for it I say!)
It may also be that the water doesnt have much to skim! A lot of people think that just because a
skimmer isnt pulling a ton of skimmate that the
skimmer has a problem. Your tank may have matured and is dealing with the dissolved organics much better on it's own and thus there are less in the system. A great example of this oddity is when I started feeding live
phytoplankton from my own cultures. I feed more phyto which would lead most to expect the
skimmer to go nuts. But seeing as how the majority of the cells are not only live but thriving it's technically not a dissolved organic but a living plankton, hence not skimming out as much. While my
skimmer started pulling less my nutrients still dropped despite my increase in feeding, this is because the live algae started feeding on the nutrients itself as well. Some arent so lucky to have a tank strike a balance and it's just one method of keeping a tank compared to so many others that work just as well (and possibly better).
If it concerns you and you want to keep the same
skimmer I'd go the pump route. If you want a new one.. I'd go ASM personally and pick a
skimmer with a little higher rating than your total volume (sump,
skimmer, tank, and all).
In edit... hows that aquamedic Dfisch? I was looking at picking one up for another one of my goofball projects as they've got a nice price on em. I'm using a Remora hang on in the
sump of my 72 display with good results but I figure if I'm going to pick up a second
skimmer I may as well play the market.
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