[BensNorthsideAquatics]

This is my 90 gallon aquarium with live plants and a 407 Fluval filter on it, i have been recently surprised with fish but i am now wondering if my tank is overstocked i have a electric blue Acara, Angelfish, 5 Red head Geo’s, 4 Columbian Neiva Geo’s, rainbow cichlid, -> *not cichlids; a spotted pictus catfish, 4 red mouth headstanders, 5 Alestopetersius brichardi(tetras) and a red ancistrus pleco. I am currently doing a 75% waterchange once a week.

 

[BensNorthsideAquatics]

Yes.
Your 75 gallon aquarium is overstocked. Have you checked the measured level of Nitrates in this tank before a scheduled water change?

Yes i check my water parameters and 75 gallon?

 

[BensNorthsideAquatics]

I would say overstocked yes, at least in terms of fish who stick to the bottom of the tank.

I'm assuming the Columbian Neiva Geo are another geophagus? That isn't going to end well, especially in a 48" tank. At best you'll have a pummeled pictus, a feud with the Acara over territory, and potential hybrids as the geophagus breed with one another. At worst, the territory disputes will result in one surviving Geophagus male and females that're amiable to breeding. If they aren't Geophagus, you'll still run into a cornered catfish and spats with the Acara.

Also, while gravel won't hurt Geophagus they're sand sifters. I haven't kept Geophagus personally as my 125g (72") already had corydoras and I wouldn't keep them in my 48" tanks for the potential aggression, I can say that species who sift sand are night and day when it comes to their substate. My Bolivian rams and corydoras are infinitely more active and lively once I changed over to sand, and I would expect the same for Geophagus.

ok thank you very much for your advice i also have a empty 40 and 55 gallon should i move some of these fish there or if not which fish should i get rid of?

 

[BensNorthsideAquatics]

I would say overstocked yes, at least in terms of fish who stick to the bottom of the tank.

I'm assuming the Columbian Neiva Geo are another geophagus? That isn't going to end well, especially in a 48" tank. At best you'll have a pummeled pictus, a feud with the Acara over territory, and potential hybrids as the geophagus breed with one another. At worst, the territory disputes will result in one surviving Geophagus male and females that're amiable to breeding. If they aren't Geophagus, you'll still run into a cornered catfish and spats with the Acara.

Also, while gravel won't hurt Geophagus they're sand sifters. I haven't kept Geophagus personally as my 125g (72") already had corydoras and I wouldn't keep them in my 48" tanks for the potential aggression, I can say that species who sift sand are night and day when it comes to their substate. My Bolivian rams and corydoras are infinitely more active and lively once I changed over to sand, and I would expect the same for Geophagus.

If i moved the Geo’s to this Aquarium (78gal) and added sand which ones should i move and should i take out the Cuban cichlid too?