Introducing new fish

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Joshuaharestad created the topic: Introducing new fish

Okay, if you read my previous post you know I was trying to add silver dollars to my tank. First they were too small and the oscar wouldn't stop chasing them. I took them to a fish store and exchanged them for two larger SD's that are big enough to not look like food. The oscar still chases them around a bit, not relentlessly, just every once in a while he's a jerk for a bit. They don't seem to have trouble getting away, but I worry about them being stressed. I realize they need a school but the store just had the two big ones together.

Here's my question, is some aggression when introducing normal, and how much/ how long is it normal? Will there come a point where he'll likely stop attacking, it's only been two days so far, or should I get rid of the SD's and give up on tank mates, or get a few more SD's to increase the size of the school? Would that likely increase or decrease his aggression? I'm going to hit a wall on tank capacity, I'm at a 75 with 140 gallons filtration and 90 gallon oxygen, medium planted tank. Don't think I can really do a full school.

I'd really like to have another fish or two in there, but not if their just going to be terrorized relentlessly. Any advice is sincerely appreciated!
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Suprd71 replied the topic: Introducing new fish

A 75g tank is the bare minimum recommended for a single Oscar. No tankmates, especially a school of SD. I always caution folks that a well cared for and genetically strong Oscar can easily reach 14ins and approach 3lbs in weight. A cichlid of that size, any cichlid, needs more than the 48x18 footprint of a 75g tank. Should your Oscar stay in the 10in range, which is a smallish adult, the 75 will suffice with regular large water changes. As for aggression, all fish are different. Some tolerant, some not at all. There is nothing you can do to make fish get along, except provide very large living quarters, and that sometimes fails also. I strongly suggest you concentrate on Oscar as a single fish, they do very well alone, don't need tankmates.


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Joshuaharestad replied the topic: Introducing new fish

Thank you. I should have mentioned I will be upgrading the tank in the near future. All fish are fairly small, at least for what they are, at the moment.
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Joshuaharestad replied the topic: Introducing new fish

For anyone curious the oscar does seem to be chasing the silver dollars less each day. So far today he has been completely ignoring them. :)
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Joshuaharestad replied the topic: Introducing new fish

I guess I shouldn't have put up that last post. Almost immediately after I did the oscar had a massive tantrum. Started uprooting plants, knocking things over, and attacking the SD's. I have rehomed the SD's for their own safety. My oscar will be a solo fish.
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DRACO replied the topic: Introducing new fish

well, congratz... you had experience the true character of an oscar...

if you gonna mix-up again when tank had been upgraded,
you can try to remove the oscar from the tank and re-introduce it
after putting the new fish ahead of him. sometimes this method works
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