02-01-2007, 11:13 PM
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Well goldfish and pleco won't go together too long but that is another issue.
Ok, I would say there are a couple things goping. The first is the slime coat of a fish is a substitute for plecos when they don't get fresh vegetable matter. Don't ask me where I found it, I have not been able to find the link. They need to have fresh zucchini, cucumber, asparagus, sweet potatoes, canned no salt green beans or some other vegetable that has some kind of skin and flesh.
As for hiding places, get them alot more of them and soon. They will start to fight with each other for hiding places and they will hurt, damage or even kill each other in foghts over the lone cave and most likely the largest will win. Even the females will fight like this as I have seen first hand.
90 gallon, 10 BN pleco, not bad but make sure your filtration to handle the bioload. As for the goldfish, for the health of the BN, IMHO, you need to get them out. They prefer colder water than BN and produce way too much waste to be in there with that many BN. You may be able to make it work but I would not recommend it.
Drop half of a small zucchini in the tank with a plant anchor stuck through it to make it sink and see how much they eat in a work day. If they are eating it all then they need more. Make sure to have some good algae tablets, shrimp pellets, bloodworms and a variety of algae/spirulina based wafers or pellets and 1-2 times give them some protein in the form of bloodworms, shrimp pellets or other meaty based food. Small amount of protein and large amonts of veggies/algae will keep them happy and lots of hiding places.