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If you've only got the one molly, and he's a male, often the problem is that he's horny and frustrated, so he will pester everyone around. Options are to swap him for a female, or add 2-3 females (adding only one causes him to constantly pester just the one female, 2-3 spreads out his...

If you can give the comet to someone with a pond, that'd be ideal. They really get too large for most tanks anyways, and prefer the cooler temps of a pond. Since he's a pretty big fish already from the sounds of it, hopefully him being gone will help lower the strain on the tank and improve...

I'm not familiar with that type of fish. I assume you mean cichlids? Do you have enough hiding spaces for the female to avoid the male and to break up the lines of sight in the tank? More cover often reduces aggression as the male isn't constantly seeing and then attacking the female, and...

I feel like mollies are one of those fish that are sold as "easy beginner fish" but are actually relatively sensitive. They seem to be one of the first to show signs of water quality issues as well. They can be acclimated to SW fairly easily, so I think that in freshwater they are just not...

What type of barbs? A lot of barbs are natural nippers (notably the popular tiger barbs), and this behavior is more problematic with small numbers. Having a school of barbs will allow them to pester each other and no one fish gets picked on too much. Then having no other barbs, your barb is...

I wonder if he is either blind or mostly blind, and so he doesn't travel around the tank as much / can't see his ladies to pursue them. Swims at an angle to see a little or just to orient himself to water current. Do you know if he is an older fish? Out of curiosity, what are you feeding...

Sometimes catfish are actually helpful as they swim along the bottom and kick up the poo and help the filter suck it up. Though they also contribute, so it's kinda 6 of one and half a dozen of the other I guess...

Yes, you just hold the vacuum a bit above the sand and the poo will kinda float up and off and get siphoned out. At first you might vacuum up some light particles but after a few times all the light stuff will be gone and the rest will be more settled. Alternatively / additionally, you can...

Oooh, such nice clean fresh sand! That's a fair number of fish all at once - make sure to keep an eye on the parameters and be ready to do water changes if you're seeing ammonia. Did you seed it with media / bacteria from an established tank?

Oh, how do you find the pencil fish personality-wise? They seem neat but it's so hard to tell whether they have interesting behavior when just looking at pictures.

They look green from the picture. I'm having some difficulty with plants in my 20 long - the crypts are happy as well as a few others, and then there are those that slowly go downhill. I feel like plants are a whole new learning curve from fish.

Unless you have really soft water, regular water changes should replenish the water with any calcium that is being used (and there really isn't a lot of usage of calcium in FW that I know of...). I've also read you can feed a snail a piece of blanched spinach to supplement calcium. Take the...

Is there a specific fish you're looking at? Starting a new tank, it's easiest to pick one fish that you're really interested in keeping, and then build around that. 55g is a nice size to work with for a community or a grouping of smaller oddballs. Sometimes if you go to either your LFS or...

Are they doing it at a certain time? Like after lights out, if they are startled, if you move stuff around in the tank and they hide? A lot of fish will lose color or vibrancy at night or in response to stress. Also what size tank are they in? Balas get pretty large and active so they need...

Certainly could be. Unless you can find pictures to confirm, you might just have to wait and see.

Welcome, glad you decided to join up! :cool: Baby cories must be adorable! Wish mine would breed.

I can't see a picture?

I think there is some individuality in some fish - I had a kuhli loach that would do laps around the tank (vertical laps), none of the others did. Didn't seem to cause an issue. Is the cory whacking into the glass or just swimming along the glass? Swimming along it is normal (they also go...

Hard to see your tank from that angle, but your filter system looks neat. It's like glad-ware planted containers draining into one another? Do you add fertilizers? Have you considered having more lower light plants in the tank itself?

There just isn't room in there for the goldfish. Picture a 20cm or more fish in your tank. They really need 20 gallons (about 75 liter) minimum. Plus even at a smaller size, goldfish create a lot of waste and it will become more or less impossible to keep water quality up in such a small...