Well, we asked about the gravel substrate issue at the store, and were assured that it was ok for a Geophagus. We brought our dead Satanoperca jurupari with us and after an inspection, they didn't think that it choked, but that it was parasites that caused the death. He had lived in the tank on the gravel fine for two years.
If the fish
died in your tank from parasites and you never added any sort of
anti-parasite medication, your tank is still full of lethal parasites!! Again, why on earth did you get another fish? Simple
logic should have suggested that was a bad idea.
think the parasites had more to do with stunted growth than the tank size. It is 20 gallons but we only had five fish in there, all under three inches. By the inch rule, we had at least an inch for growth on each fish.
If it had parasites bad enough to suddenly kill it, they aren't the reason the fish was stunted. A long term, low-level parasitic infection capable of stunting your fish wouldn't have resulted in a sudden, violent death.
The rule is actually "one gallon per inch of ADULT length for slender, thin-bodied fish under 5 inches of ADULT length". Only your dwarf gourami is (barely) covered by the guideline.
Now the total inch count of our four fish is 9 and the tank looks kind of empty. (3 inch plecostamous, 2 inch dwarf gourami, 2 inch geophagus, 2 inch clown loach) I was hoping to add some more color to fill it out a little, some fish(es) that would stay out of the way of the clown loach and geophagus and occupy the middle or top area of the tank peacefully with the dwarf gourami. (a few neon tetras? a betta? genetically modified glo-fish?)
If that's a common pleco, he has an adult size of over a foot. Clown loaches should be kept in groups and have an adult size of a foot (and should at least reach 4" or longer in the course of 2 years). The dwarf gourami is ok for a 20g tank. Your
last eartheater had an adult length of 10" and should have
been 10" since he was more than a year old.
Your 20g tank is too small for these fish and you are stunting them, something that is not condoned on this forum. The fish you
currently have shouldn't even be in that tank, much less any additional specimens.
No one wants to take a stab at the new Geophagus ID? He's got a single dark spot on each side of of his body near the middle that maybe the flash minimized in the pictures. There's a little bit of a dark pattern on the top too. I was just looking for myself and thought maybe it was one of the following three? : 'Geophagus' steindachneri? Geophagus surinamensis?'Geophagus' crassilabris? Anyhow, he/she already appears to be more aggresive than the Satanoperca, chasing the clown loach and plecostamous a little
What really irks me is that you have enough knowledge that you can rattle off all these scientific names but not enough sense to perform a simple Google search for adult sizes!
- Satanoperca jurupari -- 10", too big for a 20g
'Geophagus' steindachneri -- 6", too big for a 20g
Geophagus surinamensis -- 10", too big for a 20g
'Geophagus' crassilabris -- 8", too big for a 20g
You need a bigger tank, anti-parasite meds and an LFS that isn't going to lie to you through their teeth! Since its pretty well evident that
someone's been misinforming you about stocking your tank, I suggest that you also rethink the advice you've recieved about substrates.