I just hooked my skimmer up and its not brown like people say there's is. Mine is coming out bubbles at top then turning to water. Is this normal? I've never had a skimmer hooked up on this tank since it started running 4mnths back.
Those skimmers are very hard to dial in.....water level and flow affect them a great deal. Dial it in at the top water level and just leave it or they overflow.
Personally, I like the tank bigger than the skimmer is rated for. That way you don't run into the problem I have (skimmer doesn't produce enough foam to take anything out because I don't have a big enough bio-load). The down side is that you walk a fine line between overwhelming your skimmer.
The general consensus is have your skimmer rated for 2x your tank size though...unless you subscribe to the algae scrubber philosophy, then you don't even need a skimmer.
Personally, I like the tank bigger than the skimmer is rated for. That way you don't run into the problem I have (skimmer doesn't produce enough foam to take anything out because I don't have a big enough bio-load).
I've never run into this problem, but then again I've never had an overly HUGE skimmer before. I've always overshot and been happy with the level of muck they pull.
Do you think your issue was that the neck width was so big, that there wasn't enough organics/protein/muck to create a good (rising) foam head? Could it be because your water-level was too low for your skimmer height? Just throwing out ideas...
I used to subscribe to the "under skimming" idea too... Until I downsized and kept my ASM g2 on my Biocube/sump setup. Now I set it to pull really dry. Between that and my filter sock I'm extremely happy with the way it's all working! Maybe post pictures of the skimmer in question so we can see what you need to do?