02-09-2008, 07:19 PM
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I hope your daughter took losing the fish well. Your tank looks like it is beginning to end its cycling process. Yes, you did add too many fish too quickly. The tank could not support the additional biological load(fishy waste).
I would recommend changing 5g at a time and no more than 10g. This should be done weekly, as a minimum rule of thumb. Watch doing gravel sweeps. Most of your bacteria bed is located in the gravel, so just be careful.
I would also surmise that the catfish were proboably cories. These are a great fish for the bottom of the tank because they are very active and consume alot of uneaten food. You may want a couple more.
Set up a feeding routine. Maybe 2-3 times per day and no more than the fish will consume in 5 minutes. A maintainence schedule is also mandatory.
Just be patient. It is key in any tank set up.
By the way is your brother/brother-in-law volunteering any labor?