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Not the greatest picture had lights turned off so neons are abit discoulerd but ye its really filfy
That looks like a pretty nice set up . The tank looks healthy. Maybe add a small bubbler behind the ship.
Most people think that algae in a fish tank is a bad thing, little do they know.
Scientific Fact:
Algae in a fish tank is really good. It actually breaks down organic matter ( as in old food and fish poo )
During the day time or while the light is on the algae will also absorb the carbon dioxide and produce oxygen.
So don’t be so quick to be rid of it just cause it is a little bit of an eye soar.
( to be honest, I really think your tank looks quite beautiful I love the way it looks. Kinda looks like something you’d see at the bottom of an old lake)
Anyhow
Fish also enjoy eating algae and it’s good for them..
One way to be rid of algae is to get your tank one or two
Scientific name: Hypostomus plecostomus
I’ve put a couple pictures below showing what they look like in case you didn’t know already…
If you don’t want it on the front of the tank just use a razor blade and scape it away..
if you don’t want it at all.
They have algae remover at Walmart, petsmart, petco, Amazon. and so on…
Now for your fish problem.
I Recommend to take any unwanted fish to “ petsmart or petco “ they’ll except them..
They are not going to give you any money or store credits or anything like that for the fish..
Any age is fine but if you want them to have a better chance of survival, than I would wait a month or so..
As for the gender of the Mollies I’ve attached a picture.
Be aware that Mollies can indeed breed with Guppies which creates a hybrid fry…
I’ve attached a link that will explain about molly guppy hybrids.
If you have male and female guppies in the tank, and male and female mollies, it will be hard to cross-breed. However, if you have just one male guppy and two or three female mollies, this will be possible to cross-breed.
aquariapassion.com