Would this be overstocking my 75 gallon?
I have a 75 gallon aquarium that's been set up for about 2 years, with 2 Penguin 350 Biowheel filters that have a 700 gph rating and bio-stars and foam media. My original stocking plan was 10 Harlequin Rasboras, 9 Gold Tetras, 10 Panda Cories, and 6 Praecox Rainbows. I originally bought 4 Pandas, and over those 2 years 6 fry have been born and survived on their own, bringing me to my target number of 10 Catfish. That stocking has worked great so far, I do weekly 1/3 water changes and the levels have been great, with 0 ammonia, 0 Nitrites, and Nitrates always below 10 PPM. I have no live plants for this aquarium, and I don't want to get any.
Last October there was an illness, and now there are only 2 Dwarf Neon Rainbowfish rather than 6. My question now pertains to the Rainbowfish and the cories. I know I need to replenish my Rainbowfish school, and I am thinking of getting a larger Rainbowfish school this time around so I have more than 6 Rainbows total, but I'm not sure how many I could fit without overstocking.
What complicates all this is that the Panda Cories will continue to breed, and every now and then a fry will survive. Since the Pandas are by far my favorite fish, I'd rather not get rid of the fry that show up at intervals. If my Cory population continues to grow as it has, in another 1-2 years or so I may have 5 more Panda Cories. Will I have room for those additions, or will they cause my tank to be overstocked? In other words, would I have room for 15 Panda Cories, 10 Harlequin Rasboras, 9 Gold Tetras, and 6 Dwarf Neon Rainbowfish in a 75 gallon aquarium?
The second part of my question is, would I also have room for that many fish plus 1-3 more Rainbows, or would that be unwise? I don't want to buy more Rainbows and have a bigger Rainbow school now only to have to give up some of the future Panda Cory fry later.
Thanks for reading all of that!
I say this because once more fish are added ,we invariably end up offering more food which can become excessive.Larger water changes dilute/remove,more of what don't belong in the tank.
Could always get another smaller tank for cory fry?
Would upping the weekly water changes to 50% be about right?
I suppose I could get another tank for the Pandas to overflow into, but I'm running out of places in the house to put an aquarium (or that's what I'm told). If I were to keep at least 5 more of the fry in the 75 would I still be okay in there?
Ideally you wish to keep organic levels (nitrAtes) at or below 20ppm between weekly water change.
If nitrAtes creep above 40 ppm, then less food and larger water change will help.
I think you're fine. Deal with too many corys when you have too many corys. Right now I'd say you can go up to 10 rainbows without a problem if you'd like, though upping the % on that water change isn't a bad suggestion. Corys are pretty light on the bio load and the tetras you mentioned aren't heavy. You're doing alright.
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